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

Read also:

• What would happen if the Soviet Union had simply annexed Manchuria after World War 2 or kept it independent as a puppet state allied them and separate from China as China was too weak too oppose it anyway?
• Why do men think all women are the same?
• Why do people see porn pics when they can watch porn videos instead?
• Red Dead Redemption 2's PS5 Version Could Be Announced Next Week - Push Square
• Why is my crush beautiful to me but not to others?
• Why does my sister want to have sex with me? What should I do?
• BYU’s Lexy Lowry destroys national record, finishes 2nd in NCAA steeplechase - Deseret News
• I discovered the 5 plants that moles hate, to stop them from causing havoc in my backyard - Homes and Gardens
• Which document should be pointed out to a holocaust denier?
• Do you believe that social media companies should allow posts spreading misinformation about election results, as suggested by Rep. Jim Jordan?