A small accounting firm is considering the purchase of a computer software package that would greatly reduce the amount of time needed to prepare tax forms. The software costs $2250 and this expense will be incurred immediately. The firm estimates that it will save $550 of cash flow at the end of each year beginning in one year for 8 consecutive years, and also save $1513 in year 9. What is the payback on the computer package? Because payback is typically defined as an integer (e.g. 3 years and not as 3.74 years), place your answer as an integer.