#include <iostream>

using namespace std;



int main()

{

	double input;

	cout.setf(ios::fixed);

	cout.precision(2);

	while(cin>>input)

	{

		cout.setf(ios::fixed);

		cout.precision(2);

		if(input!=0)
		{
			cout<<input<<endl;
		}
		else
		{
			cout<<"0.00"<<endl;
		}

	}



	return 0;

}