#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using std::cin;
using std::cout;
using std::vector;

int main() {
	int n;
	cin >> n;
	
	int ans = (n - 1) * (n - 1);
	cout << ans << '\n';
	
	return 0;
}