<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<h7> How many pairs of sneakers did you buy?</h7>
<br>
<h5>
<input type="number" onkeyup="bonus(this.value)">
</h5>
<br>
<div id="otpt">0 Bonuses</div>
<script>
function bonus(value) {
document.getElementById("otpt").innerHTML = (value * 25) + " Bonuses";
}
</script>
</body>
</html>