diff --git a/2023/day04.py b/2023/day04.py
new file mode 100755
index 0000000..3ad6e0c
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+++ b/2023/day04.py
@@ -0,0 +1,61 @@
+#!/usr/bin/python3
+"""
+Jour 04 du défi Advent Of Code pour l'année 2023
+"""
+
+def read_sample():
+    """récupère les entrées depuis le fichier texte correspondant"""
+    with open('inputs/day04.txt', 'r') as f:
+        sample = f.read().split('\n')
+    sample = [ i for i in sample if i != '' ]
+    return sample
+
+
+def parse_card(text):
+    text = text.split(": ")[1]
+    p1, p2 = text.split(" | ")
+    return ([int(i) for i in p1.split(" ") if i!=""], [int(i) for i in p2.split(" ") if i!=""])
+
+
+def matching(card):
+    winning = card[0]
+    possessed = card[1]
+    return sum([1 for i in possessed if i in winning])
+
+
+def points(card):
+    total = matching(card)
+    if (total > 0):
+        return 2**(total-1)
+    return 0
+
+
+def part1(sample):
+    """Partie 1 du défi"""
+    cards = [parse_card(i) for i in sample]
+    return sum([points(card) for card in cards])
+
+def part2(sample):
+    """Partie 2 du défi"""
+    cards = [parse_card(i) for i in sample]
+    cards_d = {i: (1, cards[i]) for i in range(len(cards))}
+    
+    for key in cards_d.keys():
+        count, card = cards_d[key]
+        p = matching(card)
+        if p > 0:
+            for i in range(key+1, key+p+1):
+                if (i in cards_d.keys()):
+                    cards_d[i] = ( cards_d[i][0]+count, cards_d[i][1])
+    
+    return sum([cards_d[key][0] for key in cards_d.keys()])
+
+
+def main():
+    """Fonction principale"""
+    sample = read_sample()
+    print(f"part1: {part1(sample)}")
+    print(f"part2: {part2(sample)}")
+
+if __name__ == "__main__":
+    main()
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