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

Read also:

• MIT’s Chilling Experiment That Could Prove Gravity Is Quantum - SciTechDaily
• Ridley Scott's New Sydney Sweeney Thriller Tops the Streaming Charts After Just 1 Day - Comic Book Resources
• Why do we let ugly men exist?
• This Simple Dietary Trick Could Improve Your Sleep in 24 Hours - SciTechDaily
• Treasury Secretary Busts ‘Alarmist’ Inflation Predictions - The Daily Wire
• SpaceX marks 500th Falcon launch with Starlink 11-22 Mission - Teslarati
• China Auto Body Slams ‘Vicious Competition’ After BYD Price Cuts - Bloomberg
• Can you explain the difference between “mi piace” and “mi piacciono” in Italian?
• Can an astrologer predict that someone is in a physical relationship before marriage?
• Why do I like to eat my own cum?