#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
const double PI=3.1415926;
int r;
double c,s;
cin>>r;
c=PI*2*r;
s=PI*r*r;
cout<<fixed<<setprecision(2)<<s<<endl;
cout<<fixed<<setprecision(2)<<c<<endl;
return 0;
}
/**************************************************************
	Problem: 1317
	User: HUANGYIBO
	Language: C++
	Result: Wrong Answer
****************************************************************/