#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b;
	cin>>a;
	if(a>0){
		b=a;
	} 
	if(a<0){
	 	b=0-a;
	} 
	cout<<b;
}
/**************************************************************
	Problem: 1348
	User: toughuatao1
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/