<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 <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <unordered_set>
#include <queue>
#include <deque>
#include <string>
#include <sstream>
#include <iomanip>
#include <map>
#include <unordered_map>
#include <stack>
#include <cstdio>
#include <climits>
#include <tuple>
#include <ctime>
#include <cstring>
#include <numeric>
#include <functional>
#include <chrono>
#include <cassert>
#include <bitset>
using namespace std;
using ll = long long;
const ll INF = 2e9;
vector <vector<int>> gp;
vector<int> vis;
vector<int> dist;
vector<int> v;
string fibWord(int n)
{
    string Sn_1 = "0";
    string Sn = "01";
    string tmp;
    for (int i = 2; i <= n; i++)
    {
        tmp = Sn;
        Sn += Sn_1;
        Sn_1 = tmp;
    }

    return Sn;
}

void solution() {
    int n; cin >> n;
    cout << 2 - n * n << endl;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //int T; cin >> T;
    //while (T--){
    solution();
    //}
}