How many patients are not using Procrastin-X as medication?
SELECT count(*) FROM patient WHERE SSN NOT IN ( SELECT T1.patient FROM Prescribes AS T1 JOIN Medication AS T2 ON T1.Medication  =  T2.Code WHERE T2.name  =  'Procrastin-X' )
SELECT count(*) FROM patient WHERE SSN NOT IN ( SELECT T1.patient FROM Prescribes AS T1 JOIN Medication AS T2 ON T1.Medication  =  T2.Code WHERE T2.name  =  'Procrastin-X' )
[{'count(*)': 3}]