while( keys %addedLow < keys %lowlevelH ){
  for my $lowLevel ( keys %lowlevelH ){
    if( exists $addedLow{$lowLevel} ){
      next;
    }
    if( $mid{$midItem}{CNT} + $lowlevelH{$lowLevel} <= 35000 ){
      push( @{$mid{$midItem}{LowLevel}}, $lowLevel );
      $mid{$midItem}{CNT} += $lowlevelH{$lowLevel};
      $addedLow{$lowLevel} = 1;
    }
  }
  $midItem++;
}