#include <bits/stdc++.h>
using namespace std;
int main (){
  float a,s=0,b=0;
  cin>>a;
  s=a*a*3.14;
  b=a*2*3.14;
  printf("%.2f ",s);
  printf("%.2f ",b);
}

/**************************************************************
	Problem: 1005
	User: wtq001
	Language: C++
	Result: Wrong Answer
****************************************************************/