anychart.onDocumentReady(function () {
var data1 = [166, 43, -79, -46, 84, NaN];
var data2 = [50, -25, 30, 28, 83, NaN];
var chart = anychart.waterfall();
chart.addSeries(data1, data2);
for (var i = 0; i < chart.getSeriesCount(); i++) {
chart.getSeriesAt(i).name((i + 1) + " Series");
chart.legend({itemsSourceMode: "default"});
chart.title("Get and use series count");
chart.container("container");