You can quickly use built-in formulas without writing them to save time and efforts (+100 formula), and you don't need to remember how to create the formula. Dose for Excel's Formula Helper utility can easily create the formula you want with one click.
1. Click DOSE » Formula Helper.
2. Select the formula you want from the list and fill the input arguments and the click on Apply. In below example, We count either "Developer" or "Engineer" and the formula will be written for you using the arguments you filled. Result will be "5" in below example. See screenshots: