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

Read also:

• 183-million-year-old fossil gives incredible new insights into plesiosaurs from well-preserved skin - Earth.com
• Cleveland-Cliffs, Tesla, GM, Blueprint Medicines, BioNTech, DraftKings, and More Movers - Barron's
• Wall Street warns Trump aides the GOP tax bill could jolt bond markets - The Washington Post
• Why are people with borderline personality disorder so capable of ripping someone apart with their words?
• Trumpworld Is Fighting Over ‘Official’ Crypto Wallet - WIRED
• How do you know how physically attractive you actually are?
• Is it possible for humans to determine their past life as an animal? Is there a scientific method to prove this?
• Diddy Bashes Courtroom Artist for Making Him Look Like a ‘Koala’ - The Daily Beast
• What do you think of the controls that will be set up over information flows at Taiwan's Ministry of Foreign Affairs' missions?
• Man thought he was 'tired from work' before brain tumour diagnosis - BBC