#include <iostream>
#include <iomanip>

using namespace std;

int main(){
	int r;
	cin>>r;
	double pi = 3.1415926,s,c;
	s = pi * r * r;
	c = pi * 2 * r;
	cout<<fixed<<setprecision(2)<<s<<endl;
	cout<<fixed<<setprecision(2)<<c<<endl;
	return 0;
}
/**************************************************************
	Problem: 1005
	User: admin
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/