input range настройка

$(function() { 
  var values = [6, 8, 9, 10, 11, 12, 14, 18, 24, 30, 36, 48, 60, 72]; 
  var slider = $("#slider").slider({ 
    orientation: 'horizontal', 
    min: values[0], 
    max: values[values.length - 1], 
    value: values[0], 
 
    slide: function(event, ui) { 
      var includeLeft = event.keyCode != $.ui.keyCode.RIGHT; 
      var includeRight = event.keyCode != $.ui.keyCode.LEFT; 
      var value = findNearest(includeLeft, includeRight, ui.value); 
      slider.slider('value', value); 
 
      $("#amount").val('' + slider.slider('value')); 
      return false; 
    } 
  }); 
 
 
  function findNearest(includeLeft, includeRight, value) { 
    var nearest = null; 
    var diff = null; 
    for (var i = 0; i < values.length; i++) { 
      if ((includeLeft && values[i] <= value) || (includeRight && values[i] >= value)) { 
        var newDiff = Math.abs(value - values[i]); 
        if (diff == null || newDiff < diff) { 
          nearest = values[i]; 
          diff = newDiff; 
        } 
      } 
    } 
    return nearest; 
  } 
 
  $("#amount").val('' + slider.slider('value')); 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<input type="text" id="amount"> 
<div id="slider"> 
</div>