#include <bits/stdc++.h>
using namespace std;
int main()
{
    long double s;
    cin>>s;
    if(s==0)
        cout<<fixed<<setprecision(2)<<s;
    else
    {
        if(s>0)
            cout<<"-"<<fixed<<setprecision(2)<<s;
        else
            cout<<fixed<<setprecision(2)<<s-s-s;
    }
    return 0;
}