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How can I add another level to this responsive horizontal nav?

I am trying to build a responsive navigation for a website with an extra level. How would I update the following html/css/javascript to achieve this? I know this is a big ask but I am hoping someone out there knows the answer. Here is my code:

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Resposive Multi Level Horizontal Nav?</title>
    <!--nav styles-->
    <style>
        .show
        {
            display: block;
        }
        nav
        {
            width: 100%;
            float: left;
            font-family: 'Oswald', sans-serif;
            font-size: 100%;
            color: #252525;
            border-bottom: 4px solid #0069d4;
            border-top: 4px solid #0069d4;
            background-color: #fff;
        }
        ul
        {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        li
        {
            display: inline;
        }
        a
        {
            text-decoration: none;
            color: #fff;
        }
        li a
        {
            height: 60px;
            line-height: 60px;
            float: left;
            display: block;
            background-color: #fff;
            padding: 0 20px;
            color: #252525;
        }
        li a:hover
        {
            background-color: #0069d4;
            color: #fff;
            -webkit-transition-duration: 0.3s;
            transition-duration: 0.3s;
        }

        #i-nav
        {
            display: none;
            float: right;
            padding: 20px 20px;

        }
        @media (max-width: 1024px)
        {
            nav
            {
                width: 100%;
                padding: 0;
                margin: 0;
            }
            ul
            {
                width: 100%;
                display: none;
            }
            li a
            {
                width: 100%;
                padding: 0;
                margin: 0;
                text-align: center;
            }
            #i-nav
            {
                display: block;

            }
        }
    </style>
    <!--google fonts-->
    <link href='https://fonts.googleapis.com/css?family=Oswald:400,700,300' rel='stylesheet' type='text/css'>
    <link href='https://fonts.googleapis.com/css?family=Droid+Sans:400,700' rel='stylesheet' type='text/css'>
    <!--font awesome-->
    <link href="font-awesome/css/font-awesome.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <nav>
        <div><a id="i-nav" href="#"><i class="fa fa-bars fa-2x" aria-hidden="true" style="color:#0069d4;"></i></a></div>
        <ul>
            <li><a href="#">HOMEPAGE</a><li>
            <li><a href="#">PROGRAMS</a>
                <!-- add extra level here
                    <ul>
                        <li><a href="#">Program 1</a></li>
                        <li><a href="#">Program 2</a></li>
                        <li><a href="#">Program 3</a></li>
                        <li><a href="#">Program 4</a></li>
                        <li><a href="#">Program 5</a></li>
                    </ul>
                -->
            <li>
            <li><a href="#">MEMBERSHIP</a><li>
            <li><a href="#">NEWS</a><li>
            <li><a href="#">GALLERY</a><li>
            <li><a href="#">CONTACT</a><li>
        </ul>
    </nav>
    <!-- jquery -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
    <!-- script to toggle mobile menu -->
    <script>
        $(document).ready(function(){
            $('#i-nav').click(function(){
                $('ul').toggleClass('show');
            });
        });
    </script>
</body>
</html>

i am feeling charitable today ...but in the future please try making a code by yourself and then post here if it doesn't work after a few attempts

check here jsfiddle

gave a class .submenu to the second level ul

in the future i suggest not using float:left on li a , but use inline-block on top level li and block on submenu li

css code added :

ul.submenu { 
  position:absolute;
  top:100%; 
  display:none
}
ul.submenu li a { 
   display:block;
   float:none
}
nav li { 
   display:inline-block;
}
ul.submenu li { 
   display:block;
}
ul li:hover ul.submenu { 
   display:block
}
nav li  { 
   position:relative
}

also for mobile menu : jsfiddle

code added to media query :

ul.submenu { 
        position:relative;
        top:0%; 
        display:block;
        }
ul.submenu li { 
         display:block;
         }
ul.submenu li a{ 
          float:left;
          width:100%;
    }

in the future don't use line-height and also height on li a ;

and plus. in the future . PROVIDE AN EXAMPLE OF WHAT YOU HAVE TRIED FOR YOUR SPECIFIC PROBLEM !

otherwise you will get comments like the one from Paulie. and you won't get answers.

let me know if this code did the trick

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