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

Read also:

• US imports plunge in early sign of Trump tariff impact - politico.eu
• How do you trump Trump’s executive order to bring back plastic straws?
• Treasury yields tick higher after latest U.S. jobs data release - CNBC
• Report: Leafs discussed 3-way deal at deadline to send Marner to Vegas - theScore.com
• Is it wrong for me, a 14-year-old girl, to read dark romance?
• 'Contaminated' cupboard staple recalled over 'life-threatening fungi' hidden inside - children are especially at risk - The US Sun
• Engineers turn toxic ancient tomb fungus into anti-cancer drug - Phys.org
• What were my 10 favorite great rock albums that were either forgotten or hardly known by the rock community at large during 1965-‘75?
• Yes, That "Materialists" Limb-Lengthening Procedure Is Real - Popsugar
• Apple Pulls Ad Campaign Fronted By SNL Star Just One Day After Its Debut - LateNighter
• One Molecule to Sleep and Wake: A New Brain Switch Discovered - Neuroscience News