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

Read also:

• An 'invisible threat': Swarm of hidden 'city killer' asteroids around Venus could one day collide with Earth, simulations show - Live Science
• Ask Ethan: What are the "first stars" in the Universe? - Big Think
• What’s going on with measles, bird flu, and COVID? Here’s a guide to the latest. - The Boston Globe
• Pokémon Cafe’s new Mega Charizard curry plate is a work of art in more ways than one - SoraNews24
• What is the most popular boat rental service in Pompano Beach for birthday parties or special events?
• Menopause Drug Reduces Breast Cancer Growth In Clinical Trial - ScienceAlert
• Why do flat Earthers exist? Why can’t I see the Sun at night? Is it because Earth is not flat?
• Is the water safe to drink in England like here in America or is it necessary to bring tablets to prevent any cholera when in London?
• It's time to make friends with your viruses - Salon.com
• Why do some men like anal sex?
• Democrat announces run against Ernst after her 'We're all going to die' comments - ABC News