#include<bits/stdc++.h> 
using namespace std;
int main()
{
	const double PI=3.1415926;
	int r;
	double c,s;
	cin>>r;
	c=PI*2*r;
	s=PI*r*r;
	cout<<fixed<<setprecision(2)<<s<<endl;
	cout<<fixed<<setprecision(2)<<c<<endl;
	return 0;
}
/**************************************************************
	Problem: 1005
	User: dengyuanyan
	Language: C
	Result: Compile Error
****************************************************************/