DEMTG C++

#include <bits/stdc++.h>
using namespace std;
long long d, n;
int main()
{
  //  freopen("demtg.inp", "r", stdin);
  //  freopen("demtg.out", "w", stdout);
    scanf("%lld%lld\n", &d, &n);
    long long s = (((d+1)*(d+2))/2)*(n+1);
    cout << s;
}