#include <bits/stdc++.h> 
using namespace std;

int main()
{
	double n=0;
    cin>>n;
    if(n>=0)
    {
    printf("%.2f",n);
    }
    else  if(n<0)
    {
    n=0-n;
    printf("%.2f",n);
    }	
   
	return 0;
	
}

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