#include <bits/stdc++.h>
using namespace std;

using lint = long long;
using P = pair<int, int>;

const int inf = 1073741824;
const long long linf = 1152921504606846976;
const int mod = 998244353;
// const int mod = 1000000007;
const vector<int> dx = {1, 0, -1, 0}, dy = {0, 1, 0, -1};
const char L = '\n';
const char C = ' ';

#define For(i, a, b) for (int i = a; i < b; i++)
#define rFor(i, a, b) for (int i = a; i >= b; i--)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define pb push_back

#define test cout << "test:"
#define Yes cout << "Yes\n"
#define No cout << "No\n"



int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	int n;
	cin >> n;
	
	cout << (n - 1) * (n - 1) << L;
	return 0;
}