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 the final result (z) has to be displayed. In addition, every time an input value is read in, it must be displayed on the screen. Each time a multiplication of two numbers is needed, it has to be done using a multiplication subroutine. Remember that the MARIE instruction set does not have an instruction to execute multiplication, you must create a subroutine (function) that multiplies two numbers and call it each time you need it.