15439. Vera and Outfits

c
#include <bits/stdc++.h>

using namespace std;

int main(){
    cin.tie(NULL);
    cout.tie(NULL);
    ios_base::sync_with_stdio(false);

    int N;
    cin >> N;

    cout << N * (N - 1) << "\n";
    
    return 0;
}```