?using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int sum = 0;
        string s=Request.QueryString["num"];
        if (s != null)
        {
            string[] arr = s.Split(',');
            foreach (string i in arr)
            {
                sum += Convert.ToInt32(i);
            }
        }
        Response.Write("<ComputeResult>"+sum.ToString()+"</ComputeResult>");
    }
}