#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: sucongyi
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/