<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 int long long

using namespace std;

int32_t main(){
	// 2 - x^2
	int x;	cin >> x;
	cout << (2 - x * x) << "\n";
}