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

Read also:

• Has anyone ever had sex with their cousin? How did it start, and would you do it again?
• What is the most peculiar thing about the human brain?
• Who are your 5 or so favorite Quora people?
• Poop Transplants Not All They’re Cracked Up to Be - Gizmodo
• Is Melania still angry that she failed as a model? Why is she so cold and hostile? Why did she blame everyone for her actions in her trite book?
• Why do certain religions consider menstruating women to be impure? Where did the concept of impurity stem from?
• Do married men know when their wives are having affairs?
• Pharmacy Mixes Up 9-Year-Old’s ADHD Medicine, Gives Him Opioid More Powerful Than Morphine - AOL.com
• Is the Democrat party connected with organized crime in America?
• What is world history that not many people know about?
• Are there any more 'nun' jokes?
• What were Hitler’s habits?
• Why are white women so overly emotional?