diff --git a/labs02/task05.py b/labs02/task05.py
index f5cd8f5..17b231f 100644
--- a/labs02/task05.py
+++ b/labs02/task05.py
@@ -11,8 +11,9 @@ np. odległość pomiędzy punktami (0, 0, 0) i (3, 4, 0) jest równa 5.
 
 def euclidean_distance(x, y):
     dist = 0
-    for a,b in x,y:
-        dist = (sum(a-b)**2)**0.5
+    for i in range(len(x)):
+        dist += (x[i]-y[i])**2
+    dist = dist**0.5
     return dist
 
 def tests(f):