#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	float a,s;
	cin>>n;
	a=n*3.14;
	s=n*2*3.14;
	cout<<a<<endl<<s;
}
/**************************************************************
	Problem: 1005
	User: hongjiaming
	Language: C++
	Result: Wrong Answer
****************************************************************/