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