Using the MARIE computer assembly language, write a program that computes the following expression:z <-- (a * b) * (c * d). The computer will read in the input values a, b, c, and d from the keyboard, and thefinal result (z) has to be displayed. In addition, every time an input value is read in, it must be displayed on the screen. Each instance of multiplication should be carried out via your own multiplication subroutine. Remember that the instruction set does not have an instruction to execute multiplication, you must write one. The program must be tested in the MARIE simulator.