#include<bits/stdc++.h>
using namespace std;
int main(){
	int r;
	double PI=3.1415926;
	double s=0,c=0;
	scanf ("%d",&r);
	s=r*r*PI;
	c=2*r*PI;
	printf ("%.2f\n%.2f",s,c);
	return 0;
}
/**************************************************************
	Problem: 1005
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/