<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<iostream> 
#include <cassert>
#include <algorithm>
#include <set>
#include <map>
#include <cmath>
#include <queue>
#include <vector>
#include <cstring>
using namespace std;



const int N = 3e5 + 123, MX = 2e7 + 1;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int x;
	cin >> x;
	int y= 2 - x * x;
	cout << y;
	return 0; 
}

