Q10287: Gifts in a Hexagonal Box

// Run time: 0.200
#include <stdio.h>
#include <math.h>
#define EPS pow(10, -11)
#define m sqrt(7)
#define n sqrt(3)

int main()
{
   double length;

   while (scanf("%lf", &length) != EOF)
   {
       printf("%.10lf ", length*n/2+EPS);
       printf("%.10lf ", length*(2*n-3)+EPS);
       printf("%.10lf ", length*(n/4)+EPS);
       printf("%.10lf\n", length*(0.6*m-0.7*n)+EPS);
   }

   return 0;
}