#include<bits/stdc++.h>
using namespace std;
double a;
int main(){
    int n,m,k=0,j;
    cin>>n;
    if(n<0){
        n=0-n;
    }
    cout<<n;
}
/**************************************************************
	Problem: 1348
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/