Could you guide me please....

I need to insert 5 blank rows repeatedly between every existing data rows
for approximately 300 rows.

If I go about doing the repeat short-cut "Control+Y", it just repeats
inserting ONE row only between the consecutive data row.

Is there some command, which helps me highlight all the rows & allows me to
insert 5 blank rows between every consecutive existing data row?

Thanks in advance for your kind advice.