i don't know what your form looks like but assuming all of the answers are in $POST['answers'] then something like:
$count_values = array_count_values($_POST['answers']);
ksort($count_values);
$keys = array_keys($count_values);
if (($keys[0] >= 4) && (isset($count_values[5]) && $count_values[5] == 7))
{
// do something
}
else
{
// do something else
}