#include<bits/stdc++.h>
using namespace std;
int main()
{
	int j;
	cin>>j;
	float a=j*j*3.1415926,b=j*2*3.1415926;
	printf("%.2f\n",a);
	printf("%.2f",b);
return 0;	
}
/**************************************************************
	Problem: 1005
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/