#include<stdio.h>



int main(){
	double r,s,c,pi=3.1415926;
	scanf("%lf",&r);
	s=pi * r * r;
	c=2 * pi * r;
	printf("%.2lf\n%.2lf",s,c);
	
}
/**************************************************************
	Problem: 1005
	User: long
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:1144 kb
****************************************************************/