#include <bits/stdc++.h>
using namespace std;
int main(){
	int a;
	float s,j;
	scanf("%d",&a);
	s=3.1415926*a*a;
	j=3.1415926*2*a;
	printf("%.2f\n%.2f",s,j); 
	 
} 
/**************************************************************
	Problem: 1005
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/