Not sufficient

A man about to be drafted complained to the draft doctor about terrible lambago he was supposed to have and wich, he alleged, prevented his service in the Army. To support his complaint, he sent the doctor an envelop with 200 dolars inside. Then he went to the final examination, sure of exemption. But, to his great surprise, the doctor found him quite fit for service. "But, doctor", the man protested indignantly, "I've got lumbago!", "Yes", agreed the doctor, "but not enough".