#include <stdio.h>
int main(){
	int n;
	scanf("%d",&n);
	
	printf("%.2f\n%.2f",3.1415926 * n * n,3.1415926*2*n);


	return 0;
}
/**************************************************************
	Problem: 1005
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/