I require 123 JPEG images re-sizing

I need a total of 123 images re-sizing. Each image to re-sized to 4 different sizes. Each size to be saved into a separate folder.
ie - 123 images in 'Micro' folder ( 70x70px), 123 images in 'Icon' folder (230x230), 123 images to 'Medium' Folder (300x 300) and 123 images to 'Large' folder (500x500)

The images are already in the correct format (jpeg) and are in a Drop Box folder

I hope all the above makes sense - If not please do ask me for any clarification