#include<bits/stdc++.h>
using namespace std;

int main(){
	int r;
	float s,c;
	cin>>r;
	s=r*r*3.1415926;
	c=r*2*3.1415926;
	cout<<fixed<<setprecision(2)<<s<<endl;
	cout<<fixed<<setprecision(2)<<c;
	return 0;
}

/**************************************************************
	Problem: 1005
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/