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