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" />

JavaScript

$(document).on("change", "input[class *= 'input']", function() {
    var sum = 0;

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

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