instruction: Give the number of patients whose ethnicity is Hispanic or Latino - Puerto Rican that were given the drug hydrocortisone na succ.
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE demographic.ethnicity = "HISPANIC/LATINO - PUERTO RICAN" AND prescriptions.drug = "Hydrocortisone Na Succ."