#include<bits/stdc++.h>
using namespace std;
double a;
int main()
{
    cin>>a;
    double b=int(a),c=0.6;
    double d=a-b;
    if(d>=c)
        cout<<int(a)+1;
    else
        cout<<int(a);
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
double a;
cin>>a;
int b=a;
int at=a+1;
double d=a-b;
if(d>=0.6)
cout<<at;
else
cout<<b;
return 0;
}