my $daily_total = 0;
my $busi_total = 0;
my $pers_total = 0;

for my $i (0 .. 30) {
    if ($stop[$i] > 0) {
        my $daily = $stop[$i] - $start[$i];
        my $busi = $daily - $personal[$i];
    
        $daily_total += $daily;
        $busi_total += $busi;
        $pers_total += $personal[$i];
    }
}