Laravel 5.6 Javascript Inputs sum

The problem is how do I increment input id and check all inputs sum if its i<50 it form can be submitted else will give popup. Big problem is its not static inputs can be less or many.

This is my Form exams.blade.php

<form method="post" action="">


        <h3 class="page-title">Сэдэв</h3>

        <div class="panel panel-default">
            <div class="panel-heading">
                Сэдэв сонголт
            </div>

            <div class="panel-body">
            @foreach ($duplicates as $duplicate)
             нийт  асуулт байна.<br>
            <input type="number" name="number[]"></input><br><br>
            @endforeach
            <br/>

            </div>
        </div>  

    <br><button type="submit">Сонгох</button>

</form>

via Chebli Mohamed