Count if for multiple criterion

Hi,

I am working on a spreadsheet for a retail store. Column A has style numbers; Column B has an indication of A+ if that style number is a high selling item; Column C is called June and represents the number of units per style we will need in the month of June. There are some styles in June that we won't need at all and so the cell is blank for those style numbers in the June column.

I want to count all style numbers we will be ordering in June that are also indicated as an A+ item in column B.

So, I want to write a formula that says count populated cells in column C if column A has an A+.

I am lost and so frustrated. Please help!

Thanks,

Michele