diff --git a/monopol.py b/monopol.py
new file mode 100644
index 0000000..5015029
--- /dev/null
+++ b/monopol.py
@@ -0,0 +1,6 @@
+P = [0, 1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1]
+
+_ = input()
+hotels = list(map(int, input().split()))
+
+print(sum([P[i - 1] for i in hotels if i <= 12]) / 36)