#include <iostream.h>

int sum_squares_interval(int m,int n)
{
  if (m > n)
    return 0;
  else
    return m*m + sum_squares_interval(m+1,n);
}

/* OR
int sum_squares_interval(int m,int n)
{
  int sum = 0;
  for (; m<=n; m=m+1) sum=sum+m;
  return sum;
}
 */

int main()
{
  int m,n;

  cin >> m >> n;
  if (m <= n) cout << sum_squares_interval(m,n) << endl;
  else        cout << sum_squares_interval(n,m) << endl;

  return 0;
}