#include <iostream>
using namespace std;
int main()
{
	float r,pai=3.1415926;
	cin >> r;
	printf("%.2f\n",r*r*pai);
	printf("%.2f",r*2*pai);
	
	
}
/**************************************************************
	Problem: 1005
	User: xiaomingze
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/