Among the active male employees, how many of them are paid with the highest frequency?
active status of employees refers to CurrentFlag = 1; Male refers to Gender = 'M'; highest 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.CurrentFlag = 1 AND T2.Gender = 'M' AND T1.PayFrequency = 2