// School of Computer Engineering
// K.N. Toosi University of Technology

#include <stdio.h>

void store_sum(int, int*);

int a;

int main() {

  store_sum(10, &a);

  printf("%d\n", a);

  return  0;
}

void store_sum(int n, int *p) {
  int sum, i;

  sum = 0;
  for (i = 1; i <= n; i++)
    sum += i;
  
  *p = sum;
}