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








	return 0;
} 
/**************************************************************
	Problem: 1005
	User: zhangchenhao
	Language: C++
	Result: Wrong Answer
****************************************************************/