diff --git a/2024/day1/day1.py b/2024/day1/day1.py
new file mode 100644
index 0000000..6f5bc01
--- /dev/null
+++ b/2024/day1/day1.py
@@ -0,0 +1,23 @@
+from collections import Counter
+
+
+def main(lines):
+    firsts, seconds = list(sorted(x[0] for x in lines)), list(sorted(x[1] for x in lines))
+    total = sum(abs(a - b) for (a, b) in zip(firsts, seconds))
+    print("Part 1: ", total)
+
+    counts = Counter(seconds)
+    total = sum(x * counts[x] for x in firsts)
+    print("Part 2: ", total)
+
+
+if __name__ == "__main__":
+
+    import sys
+    infile = sys.argv[1]
+    
+    with open(infile) as f:
+        lines = f.readlines()
+        lines = [list(map(int, x.rstrip().split())) for x in lines]
+        main(lines)
+
diff --git a/2024/day1/input.txt b/2024/day1/input.txt
new file mode 100644
index 0000000..e142947
--- /dev/null
+++ b/2024/day1/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2024/day2/day2.py b/2024/day2/day2.py
new file mode 100644
index 0000000..56bd9fa
--- /dev/null
+++ b/2024/day2/day2.py
@@ -0,0 +1,36 @@
+from itertools import pairwise
+
+
+def is_safe(report):
+    diffs = [b - a for a, b in pairwise(report)]
+    return all(1 <= d <= 3 for d in diffs) or all(-3 <= d <= -1 for d in diffs)
+
+
+def is_safe_with_problem_damper(report):
+    for i, _ in enumerate(report):
+        copy = report[::]
+        del copy[i]
+        if is_safe(copy):
+            return True
+    return False
+
+
+def main(reports):
+    safe_reports = sum(1 for x in reports if is_safe(x))
+    print("Part 1: ", safe_reports)
+
+    safe_reports = 0
+    for report in reports:
+        if is_safe_with_problem_damper(report):
+            safe_reports += 1
+    print("Part 2: ", safe_reports)
+
+
+if __name__ == "__main__":
+    import sys
+    infile = sys.argv[1]
+    with open(infile) as f:
+        lines = f.readlines()
+        lines = [list(map(int, x.rstrip().split())) for x in lines]
+        main(lines)
+
diff --git a/2024/day2/example.txt b/2024/day2/example.txt
new file mode 100644
index 0000000..b49c10d
--- /dev/null
+++ b/2024/day2/example.txt
@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9
diff --git a/2024/day2/input.txt b/2024/day2/input.txt
new file mode 100644
index 0000000..a4d9c2f
--- /dev/null
+++ b/2024/day2/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2024/day3/day3.py b/2024/day3/day3.py
new file mode 100644
index 0000000..01ce633
--- /dev/null
+++ b/2024/day3/day3.py
@@ -0,0 +1,39 @@
+import re
+
+
+def main(content):
+    operations = re.findall(r"(?:mul\((\d+),(\d+)\))|(do\(\))|(don't\(\))", content)
+
+    # filter only mul instructions for part1, format: ('498', '303', '', '')
+    mul_operations = [x for x in operations if x[0].isnumeric()]
+    total = sum(int(a) * int(b) for a, b, *_rest in mul_operations)
+    print("Part 1: ", total)
+
+    do_mul = True
+    total = 0
+    for op in operations:
+        token = "".join(op)
+        print(token)
+        if token.startswith("don't"):
+            do_mul = False
+            print("disable_mul")
+        elif token.startswith("do"):
+            do_mul = True
+        elif token.isnumeric():
+            if do_mul:
+                a, b, *_rest = op
+                total += int(a) * int(b)
+        else:
+            raise RuntimeError(f"Invalid token {token}")
+    print("Part 2: ", total)
+
+
+if __name__ == "__main__":
+
+    import sys
+    infile = sys.argv[1]
+    
+    with open(infile) as f:
+        content = f.read()
+        main(content)
+
diff --git a/2024/day3/input.txt b/2024/day3/input.txt
new file mode 100644
index 0000000..5e64f19
--- /dev/null
+++ b/2024/day3/input.txt
@@ -0,0 +1,6 @@
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