#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: wuweimo
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/