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