Write SQL query to solve given problem: How many people with the name Alex are single and occupying organization level of 1?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.BusinessEntityID) FROM Employee AS T1 INNER JOIN Person AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE T2.FirstName = 'Alex' AND T1.MaritalStatus = 'S' AND T1.OrganizationLevel = 1