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

/**************************************************************
	Problem: 1005
	User: huangsiyuan
	Language: C
	Result: Compile Error
****************************************************************/