#include <stdlib.h>
#include <stdio.h>

int main () {
  int k = 1000000; 
  int y = k*(k+1);
  int z = y/2;
  int i, s = 0;

  for (i=0; i<=k; i++) {
    s += i;
  }

  printf("k    = %d\n", k);
  printf("sum  = %d, i = %d\n", s, i);
  printf("fsum = %d, k*(k+1) = %d\n", z, y);
}