class List {

    constructor() {

        this.collection = [];

        this.size = this.collection.length;

    }

    add(num) {

        this.collection.push(num);

        this.collection.sort((a, b) => a - b);

        this.size = this.collection.length;

    }

    remove(index) {

        if (this.collection.length - 1 >= index) {

            this.collection.splice(index, 1);

            this.size = this.collection.length;

        } else {

            throw Error('Index does not exist!');

        }

    }


    get(index) {

        if (this.collection.length - 1 >= index) {

            return this.collection[index];

        } else {

            throw Error('Index does not exist!');

        }

    }

}