Math, using set operations in JavaScript. Why? Because `+` and `-` are just too hard to use... ProTip: don't use large numbers, unless you dislike your CPU... :-D

setMath.js

(function() {

    var Unit = function(value) {
        var elements = [];
        if (value instanceof Array) {
            elements = value.slice();
        } else {
            for (var i = 0; i < value; i++) {
                elements.push(1);
            }
        }
        this.getValue = function() {
            return elements.slice();
        }
        this.toPrimitive = function() {
            return elements.reduce(function(left, right) { return left + right; }, 0);
        }
        return this;
    };

    var factory = function(value) {
        if (value instanceof Unit) {
            return value;
        }
        return new Unit(value);
    };

    var Operations = {
        add: function(left, right) {
            return factory([].concat(factory(left).getValue(), factory(right).getValue()));
        },
        subtract: function(left, right) {
            return factory(factory(left).getValue().slice(factory(right).toPrimitive()));
        },
        multiply: function(left, right) {
            return factory(factory(left).getValue().reduce(function(l, r) { return factory(l.getValue().concat(factory(right).getValue()));}, factory(0)));
        },
        power: function(base, exponent) {
            return factory(exponent).getValue().reduce(function(l, r) { return Operations.multiply(l, factory(base)); }, factory(1));
        }
    }

})();