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<head>
    <meta charset="UTF-8">
    <title>Document</title>
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    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
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    <script>
        $(document).ready(() => {
            let $btn = $('.btn');
            $btn.click((e) => {
                let $value = $('.form-control').val();
                let $p = $('p');
                $p.each((index, element) => {
                    if((index + 1) % $value == 0){
                        $(element).addClass('d-none');
                    } else {
                        $(element).addClass('alert alert-info d-block')
                    }
                });
            });
        });
    </script>
</head>
<body>
    <input type="text" class="form-control" placeholder="Въведете число"/>
    <input type="button" class="btn btn-primary" value="Тествай">

    <p>This line of text is meant to be treated as fine print. 1</p>
    <p>This line of text is meant to be treated as fine print. 2</p>
    <p>This line of text is meant to be treated as fine print. 3</p>
    <p>This line of text is meant to be treated as fine print. 4</p>
    <p>This line of text is meant to be treated as fine print. 5</p>
    <p>This line of text is meant to be treated as fine print. 6</p>
    <p>This line of text is meant to be treated as fine print. 7</p>
    <p>This line of text is meant to be treated as fine print. 8</p>
    <p>This line of text is meant to be treated as fine print. 9</p>
    <p>This line of text is meant to be treated as fine print. 10</p>
    <p>This line of text is meant to be treated as fine print. 11</p>
    <p>This line of text is meant to be treated as fine print. 12</p>
    <p>This line of text is meant to be treated as fine print. 13</p>
    <p>This line of text is meant to be treated as fine print. 14</p>
    <p>This line of text is meant to be treated as fine print. 15</p>
    <p>This line of text is meant to be treated as fine print. 16</p>
    <p>This line of text is meant to be treated as fine print. 17</p>
    <p>This line of text is meant to be treated as fine print. 18</p>
    <p>This line of text is meant to be treated as fine print. 19</p>
    <p>This line of text is meant to be treated as fine print. 20</p>

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