Brain Teaser Question. Will Give Points!?

The director of an orphanage wanted to get a present for all the kids who didn't already have every toy. The orphanage has 100 kids, 85 of whom have a bicycle, 75 have a baseball glove, 70 have a cowboy hat, and 80 have toy soldiers. What is the least possible number of kids who own a bicycle, baseball glove, cowboy hat, and toy soldiers?