#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	float b,c;
	cin>>a;
	b=a*3.1415926*a;
	c=a*2*3.1415926;
	printf("%.2f\n%.2f",b,c);
	return 0;
}

/**************************************************************
	Problem: 1005
	User: chenjunlin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/