<image> <image>

*The two images are equivalent, feel free to use either one.

Input

The input contains a single integer a (-100 ≤ a ≤ 100).

Output

Output the result – an integer number.

Example

Input


1


Output


1
#include <bits/stdc++.h>
#define f first
#define s second
#define INF 0x3f3f3f3f
#define EPS 1e-9
using namespace std;

typedef long long int ll;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ii> vii;
typedef vector<vii> vvii;
typedef unsigned long long ull;
const int SEED = chrono::steady_clock::now().time_since_epoch().count();
mt19937 rng(SEED);

void test_case(){
	int x;
	cin >> x;
	cout << 2-x*x << endl;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0); 
	int t = 1;
	//cin >> t;
	for(int i = 1; i <= t; i++){
		//cout << "Case #"<< i << ":" << endl;
		test_case();
	}
	return 0;
}