#include <bits/stdc++.h>
using namespace std;
double myfabs( double x){
	if(x>=0){
		return x;
	}else{
		return x*-1;
	}
}
int main() {
	double n;
	cin >> n;
	cout<<fixed<<setprecision(2)<<myfabs(n);
	return 0;
}