#include<bits/stdc++.h>
using namespace std;
int main(){
	int r;
	float s,c;
	cin>>r;
	s=3.1415926*r*r;
	c=3.1415926*r*2;
	printf("%.2f\n",s);
	printf("%.2f",c);
	 
	
} 
/**************************************************************
	Problem: 1005
	User: linzihang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/