diff --git a/src/Day03.java b/src/Day03.java
new file mode 100644
index 0000000..17014a3
--- /dev/null
+++ b/src/Day03.java
@@ -0,0 +1,239 @@
+import java.io.IOException;
+
+public class Day03 extends Input {
+    private Input input;
+
+    public Day03() throws IOException {
+        input = new Input();
+        input.init("in/Day03");
+    }
+
+    public int part1_sample() {
+        int rValue = 0;
+
+        for (String input : this.input.getSample_input()) {
+            rValue += getMul(input);
+        }
+
+        return rValue;
+    }
+
+    public int part1() {
+        int rValue = 0;
+
+        for (String input : this.input.getInput()) {
+            rValue += getMul(input);
+        }
+
+        return rValue;
+    }
+
+    public int part2_sample() {
+        int rValue = 0;
+        boolean mul = true;
+        String pattern_mul = "mul(";
+        String pattern_do = "do()";
+        String pattern_dont = "don't()";
+        String nums = "0123456789";
+        String num1_s = "";
+        String num2_s = "";
+        int num = 1;
+        int mul_cnt = 0;
+        int do_cnt = 0;
+        for (String input : this.input.getSample_input()) {
+            for (int i = 0; i < input.length(); i += 1) {
+                if (mul) {
+                    if (mul_cnt != pattern_mul.length()) {
+                        if (input.charAt(i) == pattern_mul.charAt(mul_cnt)) {
+                            do_cnt = 0;
+                            mul_cnt += 1;
+                        } else if (input.charAt(i) == pattern_dont.charAt(do_cnt)) {
+                            mul_cnt = 0;
+                            do_cnt += 1;
+                            if (do_cnt == pattern_dont.length()) {
+                                mul = false;
+                                do_cnt = 0;
+                            }
+                        } else {
+                            mul_cnt = 0;
+                        }
+                    } else if (input.charAt(i) == pattern_dont.charAt(do_cnt)) {
+                        mul_cnt = 0;
+                        do_cnt += 1;
+                        if (do_cnt == pattern_dont.length()) {
+                            mul = false;
+                            do_cnt = 0;
+                        }
+                    } else if (mul_cnt == pattern_mul.length()) {
+                        if (nums.contains(Character.toString(input.charAt(i)))) {
+                            if (num == 1) {
+                                num1_s += input.charAt(i);
+                            } else if (num == 2) {
+                                num2_s += input.charAt(i);
+                            } else {
+                                System.err.println("Something went wrong");
+                            }
+                        } else if (input.charAt(i) == ',' && num == 1) {
+                            num += 1;
+                        } else if (input.charAt(i) == ')' && num == 2) {
+                            int num1 = Integer.parseInt(num1_s);
+                            int num2 = Integer.parseInt(num2_s);
+                            rValue += (num1 * num2);
+                            num = 1;
+                            mul_cnt = 0;
+                            num1_s = "";
+                            num2_s = "";
+                        } else {
+                            num = 1;
+                            mul_cnt = 0;
+                            num1_s = "";
+                            num2_s = "";
+                        }
+                    } else {
+                        mul_cnt = 0;
+                        do_cnt = 0;
+                    }
+                } else {
+                    if (input.charAt(i) == pattern_do.charAt(do_cnt)) {
+                        do_cnt += 1;
+                        if (do_cnt == pattern_do.length()) {
+                            mul = true;
+                            do_cnt = 0;
+                        }
+                    } else {
+                        do_cnt = 0;
+                    }
+                }
+            }
+        }
+
+        return rValue;
+    }
+
+    public int part2() {
+        int rValue = 0;
+        boolean mul = true;
+        String pattern_mul = "mul(";
+        String pattern_do = "do()";
+        String pattern_dont = "don't()";
+        String nums = "0123456789";
+        String num1_s = "";
+        String num2_s = "";
+        int num = 1;
+        int mul_cnt = 0;
+        int do_cnt = 0;
+        for (String input : this.input.getInput()) {
+            for (int i = 0; i < input.length(); i += 1) {
+                if (mul) {
+                    if (mul_cnt != pattern_mul.length()) {
+                        if (input.charAt(i) == pattern_mul.charAt(mul_cnt)) {
+                            do_cnt = 0;
+                            mul_cnt += 1;
+                        } else if (input.charAt(i) == pattern_dont.charAt(do_cnt)) {
+                            mul_cnt = 0;
+                            do_cnt += 1;
+                            if (do_cnt == pattern_dont.length()) {
+                                mul = false;
+                                do_cnt = 0;
+                            }
+                        } else {
+                            mul_cnt = 0;
+                        }
+                    } else if (input.charAt(i) == pattern_dont.charAt(do_cnt)) {
+                        mul_cnt = 0;
+                        do_cnt += 1;
+                        if (do_cnt == pattern_dont.length()) {
+                            mul = false;
+                            do_cnt = 0;
+                        }
+                    } else if (mul_cnt == pattern_mul.length()) {
+                        if (nums.contains(Character.toString(input.charAt(i)))) {
+                            if (num == 1) {
+                                num1_s += input.charAt(i);
+                            } else if (num == 2) {
+                                num2_s += input.charAt(i);
+                            } else {
+                                System.err.println("Something went wrong");
+                            }
+                        } else if (input.charAt(i) == ',' && num == 1) {
+                            num += 1;
+                        } else if (input.charAt(i) == ')' && num == 2) {
+                            int num1 = Integer.parseInt(num1_s);
+                            int num2 = Integer.parseInt(num2_s);
+                            rValue += (num1 * num2);
+                            num = 1;
+                            mul_cnt = 0;
+                            num1_s = "";
+                            num2_s = "";
+                        } else {
+                            num = 1;
+                            mul_cnt = 0;
+                            num1_s = "";
+                            num2_s = "";
+                        }
+                    } else {
+                        mul_cnt = 0;
+                        do_cnt = 0;
+                    }
+                } else {
+                    if (input.charAt(i) == pattern_do.charAt(do_cnt)) {
+                        do_cnt += 1;
+                        if (do_cnt == pattern_do.length()) {
+                            mul = true;
+                            do_cnt = 0;
+                        }
+                    } else {
+                        do_cnt = 0;
+                    }
+                }
+            }
+        }
+
+        return rValue;
+    }
+
+    private int getMul(String input) {
+        int rValue = 0;
+        String pattern = "mul(";
+        String num1_s = "";
+        String num2_s = "";
+        String nums = "0123456789";
+        int num = 1;
+        int pattern_cnt = 0;
+        for (int i = 0; i < input.length(); i += 1) {
+            if (pattern_cnt != pattern.length()) {
+                if (input.charAt(i) == pattern.charAt(pattern_cnt)) {
+                    pattern_cnt += 1;
+                } else {
+                    pattern_cnt = 0;
+                }
+            } else {
+                if (nums.contains(Character.toString(input.charAt(i)))) {
+                    if (num == 1) {
+                        num1_s += input.charAt(i);
+                    } else if (num == 2) {
+                        num2_s += input.charAt(i);
+                    } else {
+                        System.err.println("Something went wrong");
+                    }
+                } else if (input.charAt(i) == ',' && num == 1) {
+                    num += 1;
+                } else if (input.charAt(i) == ')' && num == 2) {
+                    int num1 = Integer.parseInt(num1_s);
+                    int num2 = Integer.parseInt(num2_s);
+                    rValue += (num1 * num2);
+                    num = 1;
+                    pattern_cnt = 0;
+                    num1_s = "";
+                    num2_s = "";
+                } else {
+                    num = 1;
+                    pattern_cnt = 0;
+                    num1_s = "";
+                    num2_s = "";
+                }
+            }
+        }
+        return rValue;
+    }
+}
diff --git a/src/Main.java b/src/Main.java
index eb5a3a4..1d8c4fb 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -56,5 +56,32 @@ public class Main {
         System.out.printf("Part 1 answer = %d (%dms)\n", d2_p1, day02_p1);
         System.out.printf("Part 2 sample = %d (%dms)\n", d2_p2_sample, day02_p2_sample);
         System.out.printf("Part 2 answer = %d (%dms)\n", d2_p2, day02_p2);
+
+        System.out.println("\nDay 3:");
+        start = System.currentTimeMillis();
+        Day03 day03 = new Day03();
+        long day03_init = System.currentTimeMillis() - start;
+
+        start = System.currentTimeMillis();
+        int day03_p1_sample = day03.part1_sample();
+        long day03_p1_sample_t = System.currentTimeMillis() - start;
+
+        start = System.currentTimeMillis();
+        int day03_p1 = day03.part1();
+        long day03_p1_t = System.currentTimeMillis() - start;
+
+        start = System.currentTimeMillis();
+        int day03_p2_sample = day03.part2_sample();
+        long day03_p2_sample_t = System.currentTimeMillis() - start;
+
+        start = System.currentTimeMillis();
+        int day03_p2 = day03.part2();
+        long day03_p2_t = System.currentTimeMillis() - start;
+
+        System.out.printf("Day 3 init took %dms\n", day03_init);
+        System.out.printf("Day 3 part 1 (sample): %d (%dms)\n", day03_p1_sample, day03_p1_sample_t);
+        System.out.printf("Day 3 part 1 : %d (%dms)\n", day03_p1, day03_p1_t);
+        System.out.printf("Day 3 part 2 (sample): %d (%dms)\n", day03_p2_sample, day03_p2_sample_t);
+        System.out.printf("Day 3 part 2: %d (%dms)", day03_p2, day03_p2_t);
     }
 }