#include<bits/stdc++.h>
using namespace std;
int main()
{
    double n;
    cin>>n;
    if(n<0) {
    	printf("%.2f",n);
	}
    else {
    	printf("%.2f",n);
	}
    return 0;
}
/**************************************************************
	Problem: 1676
	User: xiaojingxuan
	Language: C++
	Result: Wrong Answer
****************************************************************/