#include<bits/stdc++.h>
using namespace std;
int main()
{
	int r;
	double pi=3.1415926;
	cin>>r;
	cout<<r*r*pi<<endl<<2*r*3.14;
    return 0;
}


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