#include <stdio.h>
#include <stdlib.h>
int main(int argc, char* argv[]) {
double n = 100.0;
double squareOfSumOfN = 0.25*n*n*(n+1)*(n+1);
double sumOfSquareOfN = n*(n+1)*(2*n+1)/6;
printf("%d\n", (long)(squareOfSumOfN - sumOfSquareOfN));
return 0;
}