If we assume forwarding will be implemented when we design the hazard detection unit, but then we forget to actually implement forwarding, what are the final register values after this instruction sequence?

The remaining three problems in this exercise assume that, before any of the above is executed, all values in data memory are zeroes and that registers R0 through R3 have the following initial values:

a. b. RO 0 0 R1 -1 4 R2 31 63 R3 1500 3000