#include <bits/stdc++.h>
using namespace std;
int main()
{
int r;
float s,c;

cin>>r;
s=3.1415926*r*r;
c=3.1415926*2*r;
printf("%.2f\n",s);
printf("%.2f\n",c);
return 0;

}

/**************************************************************
	Problem: 1005
	User: mc002
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/