#include <bits/stdc++.h>

    using namespace std;

    int power(int base, int exp) {
        if(exp == 0){
            return 1;
        }
        return base * power(base, exp - 1);
    }
    int sum(int n){
        if(n == 1){
            return power(n, n);
        }
        return sum(n - 1) + power(n, n);
    }
    int main()
    {
        int n;
        cin >> n;
        cout << sum(n) << endl;
        return 0;
    }