#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int main()
{
	float c;
	int a,i,b;
	cin>>c;
	a=floor(c);
	cout<<a<<".";
	for(i=1;i<=3;i++)
	{
		c*=10;
	}
	b=floor(c);
	cout<<b%1000;
}