Javascript sum checkboxes for if/else statment

So I have a script that will sum the values of checkboxes on my page, but I'm having trouble figuring out how to write an if/else if statement based on the value returned. I think the script would look something like this, but the fine folks on here seem to be pretty knowledgeable so any tips would be great!

Thanks in advance!

$(document).ready(function() {
function updateSum() {
  var total = 0;
  $(".sum:checked").each(function(i, n) {total += parseInt($(n).val());})
  $("#total").val(total);
}

if (total == 0) {
    "<input type="text" value="Great Job">";
else if (total == 3) {
    "<input type="text" value="Good">";
else 
    "<input type="text" value="Ok">";
}

// run the update on every checkbox change and on startup
$("input.sum").change(updateSum);
updateSum();

})