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

Read also:

• Mom of 2 Sons with Autism Has Limbs Amputated After Flesh-Eating Disease: 'I Can't Take Care of My Children’ - AOL.com
• A Massive Particle Blasted Through Earth and Scientists Think It Might Be The First Detection of Dark Matter - ZME Science
• Why cant I add weight to my lifts even though im completing my sets? Every time I try to add more weight I cant even complete one rep.
• How can a hacker damage me, realistically?
• Indians stretch, breathe and balance to mark International Day of Yoga - AP News
• People Are Sharing Things America Actually Gets Right, And It's Surprisingly Heartwarming To Read - BuzzFeed
• Yvette Cooper yet to agree deal three days before spending review - BBC
• Is Father’s Day getting more respect? Depends on who you ask - AP News
• Do you usually wear your panties over or under your pantyhose?
• Do women wear undies under leggings?