diff --git a/genetic_route.py b/genetic_route.py
index 4548b42..ab7f580 100755
--- a/genetic_route.py
+++ b/genetic_route.py
@@ -90,7 +90,7 @@ def genetic_trace_route(graph_map, packages):
         population = copy.deepcopy(new_population)
         scores = score_all(graph_map, population)
         scores.sort(key=lambda x: x[1])
-        print("Best route of all population in iteration " + i + 1)
+        print("Best route of all population in iteration " + str(i + 1))
         print(scores[0][1])
 
     scores = score_all(graph_map, population)