For the patient with an abnormal alkaliphophatase level, how many of them are admitted to the hospital?
abnormal alkaliphophatase level refers to ALP > = 300; admitted to the hospital refers to Admission = '+';
SELECT COUNT(T1.ID) FROM Patient AS T1 INNER JOIN Laboratory AS T2 ON T1.ID = T2.ID WHERE T2.ALP >= 300 AND T1.Admission = '+'