Untitled

<html>
<head>
</head>
<body>
<script>
function doit(form) {
  var i1 = form.input1.value;
  var i2 = form.input2.value;
  var i3 = form.input3.value;
  var ans = (parseInt(i1, 16) % parseInt(i2)) + parseInt(i3);

  alert(ans);

  return false;
}
</script>
<form onsubmit="doit(this);">
<input type="text" name="input1"/>
<input type="text" name="input2"/>
<input type="text" name="input3"/>
<input type="submit"/>
</form>
</body>
</html>