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