#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	double a=3.1415926*n*n*1.00;
	double b=3.1415926*2*n*1.00;
	printf("%.2f\n",a);
    printf("%.2f",b);
	
	return 0;
} 
/**************************************************************
	Problem: 1005
	User: linxichen
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/