app
        .filter('variety', function () {
            return function (number, one, many, much) {
                number = parseInt(number);

                if (number === 1) {
                    return one;
                }
                if (number >= 10 && number < 20) {
                    return much;
                } else {
                    number = (number % 10);
                    if (number === 1) {
                        return much;
                    }
                    return number > 4 ? much : many;
                }
            };
        });