#include <bits/stdc++.h>
using namespace std;
int main(){
	float s,c,r; 
	cin>>r;
	s=3.1415926*r*r;
	c=2*3.1415926*r;
	printf("%.2f\n%.2f",s,c);
	
}


/**************************************************************
	Problem: 1005
	User: 15159808820
	Language: C++
	Result: Accepted
	Time:44 ms
	Memory:2072 kb
****************************************************************/