#include <iostream>

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