John Huebner, thanks for feedback, I resolve this problem.
$total = 0;
$repeater = get_field('repeater');
if ($repeater) {
foreach ($repeater as $row) {
if (is_array($row['sub_field_name']) && $row['sub_field_name']['value'] == 'Value of field') {
$total++;
}
}
}
echo $total;