A company is transitioning to Microsoft 365 and needs to create user accounts for its employees. The IT administrator is tasked with ensuring that each user has the appropriate licenses assigned based on their roles. The company has three types of users: Standard Users, Power Users, and Administrators. Standard Users require basic access to Office applications, Power Users need additional features such as SharePoint and OneDrive, while Administrators require full access to all Microsoft 365 services, including user management capabilities. If the company has 50 Standard Users, 20 Power Users, and 5 Administrators, what is the minimum number of licenses the IT administrator must purchase if each type of user requires a different license type?