Automation of the business process

Programmer services are required. It is necessary to automate the business process of applying for a vacation. Employees write a statement in paper form, which indicates the dates of leave. The company has the following categories of leave:
• annual paid;
• without saving wages;
• childcare.
The employee writes a letter to the director, and as a matching indicates the head of the department. The dates of the employee's leave are agreed by the head of the department. After approval by the head, the dates are approved by the director. In case of successful approval, the employee shall give an application to the clerk for the preparation of documents.