01: #include <stdio.h>
02: 
03: int main(void){
04:   int i=0, sum=0;
05: 
06:  loop_in:
07:   sum += i;
08:   i++;
09:   if(i<=1000)goto loop_in;
10: 
11:   printf("%d\n",sum);
12: 
13:   return 0;
14: }