#include<stdio.h>
 
int main()
{
  int i;
  int n = 1000000;
  int s = 0;

  for (i = 0; i < n/5; i+=5) {
    s = s + i*i;
    printf("%d\n", i*i);
    s = s + (i+1)*(i+1);
    printf("%d\n", (i+1)*(i+1));
    s = s + (i+2)*(i+2);
    printf("%d\n", (i+2)*(i+2));
    s = s + (i+3)*(i+3);
    printf("%d\n", (i+3)*(i+3));
    s = s + (i+4)*(i+4);
    printf("%d\n", (i+4)*(i+4));
  }
  printf("\n\nSum of first n natural numbers is: %d\n", s);
  return 0;
}