#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<<fixed<<setprecision(4)<<b<<" ";
	cout<<fixed<<setprecision(4)<<c;
	return 0;	
}