#include<bits/stdc++.h>
using namespace std;
int main(){
  int n,s=0,c=0;
  cin>>n;
  float p=3.1415926;
  printf("%.2f",p*n*n);
  cout<<endl;
  printf("%.2f",p*2*n);
    return 0;
}
/**************************************************************
	Problem: 1005
	User: wangyousi
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/