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