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

Read also:

• Walmart Takes Flight With Drone Delivery Expansion to Five New Cities, Redefining Fast, Flexible Retail - Walmart
• SpaceX launches 500th orbital Falcon rocket on 15th anniversary of the Falcon 9 - Spaceflight Now
• What firsthand information do you have on prisoner-on-prisoner sexual abuse/rape?
• What can I say to a scammer who thinks he loves me, but I don't want to be scammed?
• Astronomers discover the largest 'ultramassive' black hole ever seen - Earth.com
• Severe bedbug infestation spreads through Coolidge Corner condo building - Brookline.News
• Police take back statement dismissing hate crime in gay actor’s killing - The Washington Post
• What is the more common way to say "you're welcome" in French: “De rien” or “Pas de problème”?
• Psilocybin induces large-scale brain network reorganization, offering insights into the psychedelic state - PsyPost
• Walk your way to a sharper mind: How 40 minutes of walking boosts brain size - Times of India
• What can help me fall asleep at night?
• Kraken Deal Andre Burakovsky To Chicago - NHL.com
• Nelly Korda makes seven birdies, storms up the leaderboard in Round 2 of U.S. Women's Open - NBC Sports
• Stopping alcoholism gets smarter with smartwatches - The Brighter Side of News
• Which type of earbuds, wired or wireless, is better for sleep and why?