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<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Marker Clustering</title>
    <style>

      #map {
        height: 100%;
      }

      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
        function getRandom(){
        var min = 40;
        var max = 60;
        return Math.random()*(max-min)+min;
    }
      function initMap() {

        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 10,
          center: {lat: 56.002853, lng: 53.013463}
        });
        var labels = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

        var markers = locations.map(function(location, i) {
          return new google.maps.Marker({
            position: location,
            label: labels[i % labels.length]
          });
        });

        var markerCluster = new MarkerClusterer(map, markers,
            {imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'});
      }

      var locations = [];
      for(i = 0; i < 1000;i++) locations[i] = {lat: getRandom(), lng: getRandom()};

    </script>
    <script src="https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/markerclusterer.js">
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=AIzaSyA-NSNd-dQHRqtBWly7zA92nue6-d6HrPU&callback=initMap">
    </script>
  </body>
</html>