#include<bits/stdc++.h>
using namespace std;
int main(){
	double pi=3.14159265,a;
	cin>>a;
	printf("%.2f\n%.2f",a*a*pi,a*2*pi);
return 0;}

/**************************************************************
	Problem: 1005
	User: fzy001
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/