#include<bits/stdc++.h>
using namespace std;
int main(){
	const double pi=3.1415926;
	int r;
	double s,d;
	cin>>r;
	s=pi*r*r;
	d=pi*2*r;
	printf("%.2lf", s);
	cout<<endl;
	printf("%.2lf", d);
	return 0;
}
/**************************************************************
	Problem: 1005
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/