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