#include <bits/stdc++.h>
using namespace std;
int main(){
	flopat s,c,r;
	cin>>r;
	s=3.1415926*r*r;
	c=2*3.1415926*r;
	printf("%.2f\n%.2f",s,c);


}

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