#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	printf("%.2f\n",3.1415926*a*a);
	printf("%.2f\n",3.1415926*2*a); 
}
/**************************************************************
	Problem: 1005
	User: baizhoudeyueguang
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/