#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main(void)
{
double num;
while (cin >> num)
{
cout << setiosflags(ios::fixed) << setprecision(2) << fabs(num) << endl;
}
return 0;
}
#include<iomanip>
#include<cmath>
using namespace std;
int main(void)
{
double num;
while (cin >> num)
{
cout << setiosflags(ios::fixed) << setprecision(2) << fabs(num) << endl;
}
return 0;
}