Highlight Cell with criteria

Hello:

Please refer to attached sheet.

The data is for week ending in row 5.

I need to highlight cell in column B based on following:

If there is no data for last (Value in Cell B3) weeks, then highlight the cell in column B.

I have manually highted B9,B12,B17,B22,B23,B24 since for these client, no data for last 3 weeks.

Please let me know if you have any questions.

Thanks and looking forward for help.

Riz