diff --git a/2021/day7/day7.py b/2021/day7/day7.py
index ce6cb31..ba590ec 100755
--- a/2021/day7/day7.py
+++ b/2021/day7/day7.py
@@ -3,13 +3,13 @@
 import sys
 
 if __name__ == '__main__':
-    inp = [int(i) for i in sys.stdin.readline().split(',')]
+    positions = [int(i) for i in sys.stdin.readline().split(',')]
 
-    def calc(f):
-        return min([
-            sum(f(abs(crab-i)) for crab in inp)
-            for i in range(min(inp), max(inp)+1)
-        ])
+    def calc(movement_cost):
+        return min(
+            sum(movement_cost(abs(position-target)) for position in positions)
+            for target in range(min(positions), max(positions)+1)
+        )
 
     print(calc(lambda n: n))
     print(calc(lambda n: n * (n+1)//2))