Three operations are required to fabricate a certain item. Rejected items from operations 1 and 2 can be reworked by operations 4 and 5 respectively.

Known that the demand of that item is 97,000 unit and the rejection rate for each operation is as follow, d₁ = 0.02, d₂ = 0.04, d₃ = 0.04, d₄ = 0.5, and d₅ = 0.5, calculate the number of units must the process start with in order to meet the required output (approximate you answer to unit).