#include<bits/stdc++.h>
using namespace std;
int main(){
	double n;
	cin>>n;
	cout<<fixed<<setprecision(2)<<abs(n)<<endl;
	return 0;
}

/**************************************************************
	Problem: 1676
	User: admin
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/