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

Read also:

• Retinal prosthesis woven from tellurium nanowires partially restores vision in blind mice - Phys.org
• The Best Late-Night Snack to Lower Cholesterol, According to Dietitians - EatingWell
• 'Cheers' star's cause of death released - KSDK
• Do flat Earthers really exist? Why do they believe the Earth is flat?
• With 2 petawatts, the powerful American ZEUS laser competes with particle accelerators. - Farmingdale Observer
• What happens when your partner doesn't see the value in you and continuously hurts you by searching for something in others knowing it hurts you?
• Isn't it unfortunate for the Democrats that we Republicans are the masters of the universe who control everything while the Democrats control nothing?
• 'Are You Depressed Or Do You Just Need Some Chicken?' — 4 Things To Ask Yourself Before Spiraling - YourTango
• Do you like high heels?
• Samsung's Galaxy Z Fold 7 somehow looks both thin and chunky in latest leaks - Android Police