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

/**************************************************************
	Problem: 1005
	User: wuzhijing
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/