#include<bits/stdc++.h>
using namespace std;
int main()
{
	float r;
	double d,c,s;
	cin >> r;
	d = 2 * r;
	c = 3.14159 * d;
	s = 3.14159 * r * r;
	printf("%.4lf",d);
	printf("%*c",1,' ');
	printf("%.4lf",c);
	printf("%*c",1,' ');
	printf("%.4lf",s);
	return 0;	
}