diff --git a/janitortroubles.py b/janitortroubles.py
new file mode 100644
index 0000000..3d44052
--- /dev/null
+++ b/janitortroubles.py
@@ -0,0 +1,4 @@
+a, b, c, d = map(int, input().split())
+s = (a + b + c + d) / 2
+k = ((s - a) * (s - b) * (s - c) * (s - d)) ** 0.5
+print(k)