diff --git a/prim.c b/prim.c
index 427012e..6d64cdb 100644
--- a/prim.c
+++ b/prim.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdbool.h>
+#include <limits.h>
 #define typ unsigned long long
 
 
@@ -16,7 +17,7 @@ return true;
 
 int main(void){
 typ int fn = 0, fn_1 = 1, fn_2 = 0;
-for(int i=0;i<700;i++)
+while(fn < ULLONG_MAX)
 {
 fn = fn_1 + fn_2;
 if(is_it_a_prim(&fn))
@@ -24,6 +25,5 @@ printf("%llu\n",fn);
 fn_2 = fn_1;
 fn_1 = fn;
 }
-getchar();
 return 0;
-}
\ No newline at end of file
+}