#include<bits/stdc++.h>
using namespace std;
int main(){
	int r;
	flaot pi=3.1415926,z,m;
	scanf("%d",&r);
	z=pi*r*r;
	m=pi*2*r;
	printf("%f\n%f",z,m);

}

/**************************************************************
	Problem: 1005
	User: zhengzihao3
	Language: C++
	Result: Compile Error
****************************************************************/