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