#include<bits/stdc++.h>
using namespace std;
int main(){
	int r;
	float pi=3.1415926,c,s;
  	scanf("%d",&r);
	s=pi*r*r;
	c=2*pi*r;
	printf("%.2f\n%.2f",s,c);
}
/**************************************************************
	Problem: 1005
	User: toughuatao1
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/