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