#include<iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n<0){
		n=0-n;
	}
	if(n>0){
		cout<<n;
		return 0;
	}
	cout<<n;
}
/**************************************************************
	Problem: 1348
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/