//p.3-40 計算圓周長和圓面積
#include<iostream>
#include<cmath>
#include<cstdlib>
#define PI 3.14

using namespace std;

int main()
{
double r,perimeter,area;
cin >> r;
perimeter=2*PI*r;
area=PI*r*r;
cout << perimeter <<endl;
cout << area;


return 0;
}