#include <iostream>
#include <math.h>
#include <cstdlib>

using namespace std;

int main()
{
    int x;
    int p = 0;
    int f = 0;
    int ptop;
    for(x=1;x<101;x++)
    {
        p+= x;
        f+= pow(x,2);
    }
    ptop = pow(p,2);
    cout << ptop-f << endl;
}