#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define Pr pair<ll,ll>
#define Tp tuple<ll,ll,ll>
using Graph = vector<vector<int>>;
#define double long double

const ll mod = 1000000007;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    ll N; cin >> N;
    ll ans = (N-1)*(N-1);
    cout << ans << endl;
}