lab5(72)

#include <iostream>
#include <cmath>
using namespace std;

void Factarial(int n){
    int f = 1, sum = 0;
    for (int i = 1; i <= n; i++){
        f = f*i;
        sum = sum + f;
    }
    cout << sum;
}


int main() {
   int c;
   cin >> c;
   Factarial(c);
  
}