#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,z,m;
	cin>>a;
	m=a*a*3.1415926;
	z=(a*2)*3.1415926;
	printf("%.2f\n",m);
	printf("%.2f",z);
}

/**************************************************************
	Problem: 1005
	User: wuzhijing
	Language: C
	Result: Compile Error
****************************************************************/