$(document).ready(function() {
  
  var owl = $("#owl-demo");
 
  owl.owlCarousel({
     
      itemsCustom : [
        [0, 1],
        [450, 1],
        [600, 2],
        [700, 2],
        [1000, 2],
        [1200, 3],
        [1400, 3],
        [1600, 3]
      ],
      navigation : true
  });
});