#include<bits/stdc++.h>
using namespace std;
int mian(){
	int r;
	float s,c;
	cin>>r;
	s=3.1415926*r*r;
	c=3.1415926*r*2;
	cout<<setprecision(2)<<s<<endl;
	cout<<setprecision(2)<<c; 
	return 0;
}

/**************************************************************
	Problem: 1005
	User: linzihang
	Language: C++
	Result: Compile Error
****************************************************************/