#include<bits/stdc++.h>
#define PI 3.1415926
using namespace std;
int main(){
    int r;
	cin>>r;
	printf("%.2f\n%.2f",r*r*PI,2*r*PI);
	return 0;
}

/**************************************************************
	Problem: 1005
	User: chenxurui
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/