JSFiddle - React, Tailwind, and code Playground

HTML

<input class="input1" /><br />
    <input class="input2" /><br />
    <input class="input3" /><br />
    <input class="input4" /><br />
    <input class="input5" /><br />

    <input id="destination" />

    <input type="button" id="btn" value="Add" />

JavaScript

$("#btn").click(function() {
            var sum = 0;

            $("input[class *= 'input']").each(function () {
                
                sum += +$(this).val();
            });

            $("#destination").val(sum);
        });