#!/usr/bin/gawk -f

# class - The class to get the count of

BEGIN{
  FS=OFS=",";
  IGNORECASE = 1;
  d = 0;
  class="true";
}

d == 1{
  if ( NF > 0 )  classes[$NF]++;
}

/@data/{d=1;}

END{
  print classes[class];
}