#include<bits/stdc++.h>
using namespace std;
int main(){
	float x,m=0,p=0;
	cin>>x;
	m=3.14*x;
	p=3.14*2*x;
	printf("%.2f\n%.2f",m,p);
}
/**************************************************************
	Problem: 1005
	User: huxuanchen
	Language: C++
	Result: Wrong Answer
****************************************************************/