diff --git a/a3/program.c b/a3/program.c
index acb8625..4c856c4 100644
--- a/a3/program.c
+++ b/a3/program.c
@@ -20,7 +20,7 @@ struct node* root;
     int i,n;
     int *a = calloc(MAX, sizeof(int));
     for (i = 0; i < MAX; i++) {
-        scanf("%d", root->data);
+        scanf("%d", &root->data);
         if(a[i]!=0){
             n++;
         }