#include<bits/stdc++.h>
using namespace std;
int main(){
double s,c,p;
int r; 
p=3.1415926;
scanf("%d",&r);
s=p*r*r;
c=p*2*r;	
printf("%.2f\n%.2f",s,c);	



	
	return 0;
}

/**************************************************************
	Problem: 1005
	User: zy002
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2076 kb
****************************************************************/