<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%
String a = request.getParameter("a");
String b = request.getParameter("b");
int va = a == null ? 0 : Integer.parseInt(a);
int vb = b == null ? 0 : Integer.parseInt(b);
%>
Insert title here
The sum of <%= a %> and <%= b %> is <%= va+vb %>.