#include <iostream>

int sum_of_square(int n) {
  int sum = 0;
  for (int i = 1; i <= n; ++i) {
    sum += i * i;
  }
  return sum;
}

int square_of_sum(int n) {
  int sum = 0;
  for (int i = 1; i <= n; ++i) {
    sum += i;
  }
  return sum * sum;
}

int main(void) {
  std::cout << square_of_sum(100) - sum_of_square(100) << std::endl;
  return 0;
}