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

Read also:

• Is it wrong of me to feel uncomfortable that my friend thinks my brother is hot?
• Is crossdressing being a transvestite?
• 'JC, Take the Wheel!' Kevin Smith Looks Back on His Hilariously Heretical 'Dogma' 25 Years Later - Rolling Stone
• Why aren't you a Trump supporter?
• Unannounced And Petty: Southwest Fired Their Skycaps, Now Charges $3 To Check Bags At The Curb—After Saying They Wouldn’t - View from the Wing
• New Nintendo Switch 2 Welcome Tour demo trailer shows off mini games and tech demos in-action - Eurogamer
• Sometime ago, the Iranian Minister said that a US Navy aircraft carrier would be an easy target for 300 speed boats armed with Katyusha rocket launchers. Is this true?
• Bank of America predicts major housing market changes are coming soon - TheStreet
• Stop Work Orders At NASA JPL - NASA Watch
• Worms Caught Creating Superorganisms in the Wild for the First Time - Indian Defence Review
• My religion teacher said that there are no atheists because in order to reject God, you must first have a concept of God, and if you have a concept of God, you are not an atheist. In what way is this true, if at all? Why?