#include<bits/stdc++.h>
using namespace std;
int main()
{
	int r;
	double pi=3.1415926,z,m;
	cin>>r;
	z=2*r*pi;
	m=r*r*pi;
	printf("%.2f\n%.2f",m,z);
    return 0;
}


/**************************************************************
	Problem: 1005
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/