#include<iostream>
#include<iomanip>
using namespace std;
int main(){
    double r,a,b,c;
    cin>>r;
    a=2*r;
    b=2*3.14159*r;
    c=3.14159*r*r;
    cout<<fixed<<setprecision(4)<<a;
    cout<<" ";
    cout<<fixed<<setprecision(4)<<b;
    cout<<" ";
    cout<<fixed<<setprecision(4)<<c;
    return 0;
}