%u041A%u043B%u0430%u0441%u0441 %u0434%u043B%u044F %u041A%u0430%u0442%u0438

    class TreeD
    {
        int x, y, z;
        TreeD();
        public TreeD(int i, int j, int k);

        public static TreeD operator +(TreeD op1, TreeD op2)
        {
            TreeD result = new TreeD();
            result.x = op1.x + op2.x;
            result.y = op1.y + op2.y;
            result.z = op1.z + op2.z;

            return result;
        }
}