What does the following MARIE program do$?$ What is the value in the AC $($hex$)$

when the program halts?

ORG $100$

Load Z

Load W

Subt Y

JnS Routine

Halt

Routine, HEX $0$

Load Y

Add X

JumpI Routine

X$,$ Hex $7$

Y$,$ Hex F

Z$,$ Hex $3$

W$,$ Hex $7$