#include<bits/stdc++.h> 
using namespace std;
int main()
{
	int r;
	cin>>r;
	const float PI=3.14;
	double s,c;
	s=PI*r*r;
	c=2*PI*r;
	cout<<s<<endl;
	cout<<c<<endl;
	return 0; 
}
/**************************************************************
	Problem: 1005
	User: dengyuanyan
	Language: C++
	Result: Wrong Answer
****************************************************************/