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

/**************************************************************
	Problem: 1005
	User: chenyichuen
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/