SAMER08F-Feynman

below give code is for samer08f spoj or feynman spoj.
please don't just copy the code understand it .If u want to i didn't have any problem.

#include<stdio.h>
int main()
{
 int a;
 while(scanf("%d",&a))
 {
  if(a==0)
   break;
  int sum;
  sum=(a*(a+1)*(2*a+1))/6;
  printf("%d\n",sum);
 }
 return 0;
}