#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int main() {
    int n, i, j, k=0;
    fin >> n;
    for (i=1; i <= n; i++) {
        for (j=1; j <= n; j++) {
            if (i == 1) {
                k++;
            } else if (i != j) {
                k++;
            }
        }
    }
    fout << k;
    return 0;
}