SELECT 
    (SELECT COUNT(*)
    FROM Doctors
    JOIN PersonalData
        ON Doctors.PersonalDataID = PersonalData.ID
    JOIN MedicalInsurance
        ON PersonalData.MedicalInsuranceID = MedicalInsurance.ID
    WHERE MedicalInsurance.Status = 'active') + 
    (SELECT COUNT(*) - 
        (SELECT COUNT(*)
        FROM Patients
        JOIN PersonalData
            ON Patients.PersonalDataID = PersonalData.ID
        JOIN MedicalInsurance
            ON PersonalData.MedicalInsuranceID = MedicalInsurance.ID
        WHERE MedicalInsurance.Status = 'active'
                AND MedicalInsurance."Number" IN 
            (SELECT MedicalInsurance."Number"
            FROM Doctors
            JOIN PersonalData
                ON Doctors.PersonalDataID = PersonalData.ID
            JOIN MedicalInsurance
                ON PersonalData.MedicalInsuranceID = MedicalInsurance.ID
            WHERE MedicalInsurance.Status = 'active' ))
            FROM Patients
            JOIN PersonalData
                ON Patients.PersonalDataID = PersonalData.ID
            JOIN MedicalInsurance
                ON PersonalData.MedicalInsuranceID = MedicalInsurance.ID
            WHERE MedicalInsurance.Status = 'active')