Among the employees whose pay frequencies are the highest, how many of them are married?
married refers to MaritalStatus = M; highest pay frequency refers to PayFrequency = 2
SELECT COUNT(T1.BusinessEntityID) FROM EmployeePayHistory AS T1 INNER JOIN Employee AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE T2.MaritalStatus = 'M' AND T1.PayFrequency = ( SELECT PayFrequency FROM EmployeePayHistory ORDER BY PayFrequency DESC LIMIT 1 )