diff --git a/advent_of_code/2024(python)/day5.py b/advent_of_code/2024(python)/day5.py
new file mode 100644
index 0000000..9135161
--- /dev/null
+++ b/advent_of_code/2024(python)/day5.py
@@ -0,0 +1,30 @@
+
+from collections import defaultdict
+
+def solve_day5_part1(rules:list[str], pages:list[str])->int:
+    before_rules = defaultdict(list)
+    for rule in rules:
+        first, second = rule.split("|")
+        # each item stores what item must be before current one
+        # before the rule : 75 : [97]
+        # after the rule :  97 : [75]
+        before_rules[int(second)].append(int(first))
+    
+    res = 0
+    for page in pages:
+        nums = [int(num) for num in page.split(",")]
+        is_ok = True
+        for i in range(1, len(nums)):
+            for j in range(i):
+                # check whether it fits with the rule
+                first_num, second_num = nums[j], nums[i]
+                if second_num in before_rules[first_num]:
+                    is_ok = False
+                    break
+            if not is_ok:
+                break
+        
+        if is_ok:
+            res += nums[len(nums)//2-1 if len(nums)%2==0 else len(nums)//2]
+
+    return res
diff --git a/advent_of_code/2024(python)/test_day5.py b/advent_of_code/2024(python)/test_day5.py
new file mode 100644
index 0000000..75b2120
--- /dev/null
+++ b/advent_of_code/2024(python)/test_day5.py
@@ -0,0 +1,1428 @@
+import unittest
+
+from day5 import solve_day5_part1
+
+
+rules5 = [
+"47|53",
+"97|13",
+"97|61",
+"97|47",
+"75|29",
+"61|13",
+"75|53",
+"29|13",
+"97|29",
+"53|29",
+"61|53",
+"97|53",
+"61|29",
+"47|13",
+"75|47",
+"97|75",
+"47|61",
+"75|61",
+"47|29",
+"75|13",
+"53|13",
+]
+
+pages5 = [
+"75,47,61,53,29",
+"97,61,53,29,13",
+"75,29,13",
+"75,97,47,61,53",
+"61,13,29",
+"97,13,75,29,47 ",
+]
+
+rules5 = [
+"76|86",
+"34|42",
+"34|59",
+"82|34",
+"82|52",
+"82|71",
+"69|15",
+"69|83",
+"69|76",
+"69|79",
+"75|37",
+"75|92",
+"75|77",
+"75|26",
+"75|43",
+"92|55",
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+"68|51",
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+"28|65",
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+"49|86",
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+"49|75",
+"49|43",
+"49|11",
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+"49|82",
+"72|93",
+"72|49",
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+"72|31",
+"72|42",
+"72|83",
+"72|87",
+"72|76",
+"72|32",
+"42|28",
+"42|43",
+"42|18",
+"42|88",
+"42|32",
+"42|96",
+"42|13",
+"42|68",
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+"37|28",
+"37|79",
+"37|81",
+"37|52",
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+"37|94",
+"37|69",
+"37|63",
+"46|68",
+"46|34",
+"46|85",
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+"46|65",
+"46|82",
+"46|26",
+"46|78",
+"46|86",
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+]
+
+pages5=[
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+"94,77,37,76,31,55,26,65,87,73,93,72,81",
+"26,65,34,23,72,37,69,73,55,31,63,83,87,76,93",
+"96,15,95,56,88,98,43,28,91,77,82,86,75",
+"46,47,81,63,93,37,94,73,72,87,31",
+"52,87,49,31,93,63,73",
+"46,49,18,28,31,15,93,11,87",
+"93,51,18,11,42,88,56,49,95,78,86,47,98,32,28",
+"59,94,79,31,76,72,77,37,42,87,83,26,82,34,23,69,63",
+"28,77,43,51,88,92,22,86,98",
+]
+
+class TestDay5(unittest.TestCase):
+
+    def test_part1(self):
+        self.assertEqual(solve_day5_part1(rules5, pages5), 4957)
+
+    # skip part2 so far
+    # def test_part2(self):
+    #     self.assertEqual(solve_day5_part2(rules5, pages5), 11387)
+
+if __name__ == "__main__":
+    unittest.main()