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

Read also:

• Architecto dolor quo cumque.
• How often do prisoners try to escape from jail/prison, and how many of them succeed?
• Why do my friends always say "yeah, we've heard this before" when I talk about something I'm passionate about?
• What is a good habit and what is bad one?
• NYC woman found a phone buried in her lawn — and police say it’s a new tactic thieves use to spy on homeowners - AOL.com
• Scottie Scheffler opens third round with triple bogey to tumble down Travelers leaderboard - NBC Sports
• What are the logical reasons against requiring an ID to vote in the USA? If the government offered to provide IDs for this purpose I fail to see why people are against it.
• Apple's latest CarPlay update revives something Android Auto did right 10 years ago [Gallery] - 9to5Google
• How and why do cats purr? Scientists finally found the answers - Earth.com
• Walmart to pay $10 million to settle lawsuit over money transfer fraud - NBC News
• Scientists Just Solved a 14,000-Year-Old Puppy Mystery - Gizmodo