#include<iostream>
#include<iomanip>
using namespace std;
#define PI 3.14159
int main(){
    double d,c,s;
    double r;
    cin>>r;
    d=2*r;
    c=2*PI*r;
    s=PI*r*r;
    cout<<fixed<<setprecision(4);
    cout<<d<<" "<<c<<" "<<s<<endl;

}