#include<bits/stdc++.h>
using namespace std;
int main()
{
	double r,a,b,c,pi=3.14159;
	cin>>r; 
	a=r*2;
	b=2*r*pi;
	c=pi*r*r;
	cout<<fixed<<setprecision(4)<<a<<" ";
	cout<<fixed<<setprecision(4)<<b<<" ";
	cout<<fixed<<setprecision(4)<<c<<" ";
	return 0; 
}