include <bits/stdc++.h> //要注意需要使用万能背包 
using namespace std;

int main(){	
	double r;
	double p = 3.14159;
	cin>>r;
	cout << fixed << setprecision(4);
	cout << 2*r<<endl;
	cout << 2*p*r <<endl;
	return 0;
}