diff --git a/day7/day7.py b/day7/day7.py
new file mode 100644
index 0000000..887d8ed
--- /dev/null
+++ b/day7/day7.py
@@ -0,0 +1,49 @@
+from collections import Counter
+
+def calculate_rank(hand):
+    card_ranks = {'2': 1, '3': 2, '4': 3, '5': 4, '6': 5, '7': 6, '8': 7, '9': 8, 'T': 9, 'J': 10, 'Q': 11, 'K': 12, 'A': 13} 
+    # substitute cards with their ranks
+    hand = sorted(card_ranks.get(c, None) or c for c in hand)[::-1]
+    cnt = Counter(hand)
+    cnt_values = sorted(cnt.values())
+    rank = {
+        "5": 10,
+        "14": 9,
+        "23": 8,
+        "113": 7,
+        "122": 6,
+        "1112": 5,
+        "11111": 4,
+    }["".join(map(str, cnt_values))]
+    # return rank and sorted hand as a tiebreaker
+    return (rank, hand)
+
+
+def part1(inp):
+    total = 0
+    hands = [l.strip().split() for l in inp.strip().split("\n")]
+    print(hands[-10: -1])
+    breakpoint()
+    hands = sorted(hands, key=lambda hb: calculate_rank(hb[0]))
+    for rank, hand in enumerate(hands):
+        hand, bid = hand
+        total += (rank + 1) * int(bid)
+    return total
+
+
+if __name__ == "__main__":
+    sample_input = """
+        32T3K 765
+        T55J5 684
+        KK677 28
+        KTJJT 220
+        QQQJA 483
+    """
+    assert part1(sample_input) == 6440
+    
+    import sys
+    if len(sys.argv) == 2:
+        with open(sys.argv[1]) as f:
+            res = part1(f.read())
+            print(f"Part 1, res={res}")
+
diff --git a/day7/input.txt b/day7/input.txt
new file mode 100644
index 0000000..3cbfc90
--- /dev/null
+++ b/day7/input.txt
@@ -0,0 +1,1000 @@
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