<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>
using namespace std;

int main () 
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	int ans = 2 - pow(n, 2);
	cout << ans << "\n";
}
