What is the sum of X+XX+XXX+XXXX?

Read also:

• Invisible radiation leaking from private satellite 'megaconstellations' could ruin radio astronomy forever, experts warn - Live Science
• Billionaire YouTuber MrBeast ‘borrowing’ money from mom for his wedding - New York Post
• How many wishes do people get on their birthday?
• Retinal prosthesis woven from tellurium nanowires partially restores vision in blind mice - Phys.org
• Dad Assumed Tingling in His Hands Was Just Pins and Needles. Days Later, He Was Paralyzed: ‘Had to Sleep with My Eyes Open’ - AOL.com
• Worms Caught Creating Superorganisms in the Wild for the First Time - Indian Defence Review
• Lower 'bad' cholesterol and higher fat-transport markers linked to less Alzheimer's risk - Medical Xpress
• Boisson Beats Andreeva, Updated French Open Women's Bracket at Roland-Garros - Bleacher Report
• Are there any guys, crossdressers, or transgender girls here who wear tampons?
• Have you ever accidentally found out that you were about to be fired?