#include <bits/stdc++.h>
using namespace std;
double p=3.14;
double c,s;
double r;
int main(){
    cin>>r;
    c=p*r*2;
    s=p*r*r;
    cout<<s<<endl;
    cout<<c<<endl;
	return 0;
}
/**************************************************************
	Problem: 1005
	User: zengdongxin
	Language: C++
	Result: Wrong Answer
****************************************************************/