#include <iostream>
using namespace std;

int main() {
    float f;
    cin>>f;
    int a;
    a=int(f);
    if (f-float(a) >= 0.5 ){
        cout<<a+1<<endl;
    }
    else if (f-float(a) <= -0.5){
        cout<<a-1<<endl;

    }
    else {
        cout<<a<<endl;
    
    }

}
// 64 位输出请用 printf("%lld")