#include<bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin>>a;
    if(a==0){
        cout<<a;
    }if(a<0){
        cout<<a-a*2;
    }if(a>0){
        cout<<a;
    }
}
/**************************************************************
	Problem: 1348
	User: xuezihong1
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/