diff --git a/cv6/a_station.c b/cv6/a_station.c
index a1cea9f..8baf409 100644
--- a/cv6/a_station.c
+++ b/cv6/a_station.c
@@ -27,7 +27,12 @@ void destroy_station(struct station* station){
 }
 
 int select_track(struct station* station, const char* target){
-    return 0;
+    unsigned long hash = 5381;
+    int c;
+    while (c = *str++)
+        hash = ((hash << 5) + hash) + c;
+
+    return hash;
 }
 
 void add_target_capacity(struct station* station,const char* target, int capacity){