adding number.js

Template.simpleCounter.rendered = function () {
    
    var btn = document.getElementById('btn'),
        input = document.getElementById('input'),
        sum = Money.findOne({name: "Total"}).total,
        tmp = 0,
        totalId;

    totalId = Money.findOne({name: "Total"})._id;

    console.log(sum);

    btn.addEventListener("click", function () {
        if(Meteor.userId()){
            tmp = parseInt(input.value);
            if(isNaN(tmp)) {
                alert('Enter a number please!');
            }
            else{
                console.log(tmp);
                sum = sum + tmp;
                console.log(sum);
                input.value = "";
                Money.update({_id: totalId},{$set: {total: sum}});
            }
        }
        else {
            alert("Log in please!")
        }
    });

};