1 files changed, 34 insertions, 0 deletions
diff --git a/20/py/d25.py b/20/py/d25.py
new file mode 100644
index 0000000..1f0a2c3
--- /dev/null
+++ b/20/py/d25.py
@@ -0,0 +1,34 @@
+import aoc20
+import sys
+
+
+def pt1(_in):
+    door_public = int(_in[0])
+    card_public = int(_in[1])
+
+    val = 1
+    door_ls = 0
+    while val != door_public:
+        door_ls += 1
+        val = (val * 7) % 20201227
+
+    val = 1
+    card_ls = 0
+    while val != card_public:
+        card_ls += 1
+        val = (val * 7) % 20201227
+
+    val = 1
+    for _ in range(door_ls):
+        val = (val * card_public) % 20201227
+    return val
+
+
+def pt2(_in):
+    pass
+
+
+if __name__ == "__main__":
+    _in = aoc20.read_input(sys.argv[1:], 25)
+    print(pt1(_in))
+    print(pt2(_in))