#include <iostream>
#include<iomanip>
using namespace std;
int main() {
double a;
cin >> a;
double b = 3.14159;
cout << fixed << setprecision(4) << 2 a << " " << fixed << setprecision(4) << 2 b a << " " << fixed << setprecision(4) << b (a * a);
return 0;
}
//泪目,第一次提交,没考虑精度