<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    let a = 5;
    a -= 1; // a = a - 1
    a *= 3; // a = a * 3
    a /= 6; // a = a / 6
    a %= 5; // a = a % 5
    alert(a)
</script>
</body>
</html>