How to add Values in a stack

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Javascript

Hi,

I have a stack of numbers which is used to display in chart...
I want to add these numbers and display the numbers in a label...
How can I do that?

$.ajax({
                url: '<%=ResolveUrl("~/Corporate/Sales.aspx/GetZoneData") %>',
                data: "{'rbtlSales':'" + selectedValue + "'}",
                dataType: "json",
                type: "POST",
                contentType: "application/json; charset=utf-8",
                success: function(data) {
                    var labels = [];
                    var datas = [];
                    $.each(data.d, function(i, item) {
                        var l = item.split('-')[0];
                        var d = item.split('-')[1];
                        var dd = d | 0;
                        labels.push(l);
                        datas.push(dd);
                    });

The Last line dd contains values... I want to add them and display it in a label...

Regards,
Sajin A