#include <stdio.h>
#include <math.h>

int main (void)
{
  int k, K, b;
  float h, w, m, d, rr, hh, excess;
  float pi = (float) atan2(0,-1);

  FILE *in = fopen ("castles.in", "r");
  fscanf (in, "%d\n", &K);
  for (k = 1; k <= K; k ++)
    {
      fscanf (in, "%f %f %f %f %d\n", &h, &w, &m, &d, &b);
      excess = 2*m*d*(h+w-2*m);
      while (b > 0)
	{
	  fscanf (in, "%f %f\n", &hh, &rr);
	  excess = excess - pi*rr*rr*hh;
	  b --;
	}
      printf ("Data Set %d:\n", k);
      printf ("%.2f\n", excess/(h*w));
    }
  fclose (in);
  return 0;
}