#include <iostream>
using namespace std;
int qz(double in)
{
    int result=(int)(in*10);
    if(result%10<5)
    {
        result/=10;
    }
    else
    {
        result+=10;
        result/=10;
    }
    return result;
}

int main()
{
    double in;
    cin>>in;
    cout<<qz(in)<<endl;
    
    
}