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

Read also:

• Have you ever had your crush reject you, and then later you all dated and married?
• Have you experimented with bestiality?
• Why do wives cheat with black guys?
• Why do some people feel down in summer, specifically in July and August? What could be the reasons behind this feeling of sadness during those months only?
• What should I do if I love a girl and she apparently doesn't love me?
• Why do you think Islam oppresses women when Christianity clearly does it more?
• New study raises big questions about taurine as anti-aging supplement - Live Science
• What's an underrated/unknown novel or series that you think deserves more attention?
• Live From: 125th U.S. Open Championship Final Qualifying - Metropolitan Golf Association
• What is the one thing you don't understand that others do?