Samnis company will require a different number of employees for a project it has undertaken. The required number of employees for each month is as follows: 15 in the first month, 30 in the second month, 10 in the third month, 30 in the fourth month, and 20 in the fifth month. Currently, the company has 20 employees. The monthly cost for each employee is 20000 TL. At the beginning of each month, new employees can be hired or existing employees can be terminated. The cost of hiring a new employee is 15000 TL, and the cost of terminating an employee is 20000 TL. At the end of each year, 10% of the employees voluntarily leave the company, and there is no cost associated with their departure. 

Use dynamic programming to determine the number of employees that should be employed each month to minimize the total cost.