#include<bits/stdc++.h>
using namespace std;
int main()
{
	int r;
	float s,c,pi=3.14;
	cin>>r;
	s=pi*r*r;
	c=pi*2*r;
	printf("%.2f\n%.2f",s,c);
}
/**************************************************************
	Problem: 1005
	User: asd
	Language: C++
	Result: Wrong Answer
****************************************************************/