#include<iostream>

using namespace std;

int main(void){
    const float pi=3.1415926;
    
    int r;
    float area=0.0,zhouchang=0.0;
    cin>>r;
    
    area = pi * r * r;
    zhouchang = 2 * pi * r;
    
    printf("%.2f\n",area);
    printf("%.2f",zhouchang);
}
/**************************************************************
	Problem: 1005
	User: 231308061
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/