#include<bits/stdc++.h>
using namespace std;
int main()
{
int a;
double s,c,pi=3.1415926;
scanf("%d",&a);
s=pi*a*a;
c=pi*2*a;
printf("%.2f %.2f",c,s);
	return 0;
}

/**************************************************************
	Problem: 1005
	User: lzc
	Language: C++
	Result: Wrong Answer
****************************************************************/