#include<bits/stdc++.h>
using namespace std;
int main()
{
int a;
    double s,c,pi=3.1415926;
    scanf("%d",&a);
    s=pi*a*a;
    c=pi*2*a;
    printf("%.2f\n%.2f",s,c);
	return 0;
}

/**************************************************************
	Problem: 1005
	User: lzc
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2076 kb
****************************************************************/