Find the factorial of a given number.
MVI B, 03H
MOV C, B
DCR C LOOP1
MOV E, C
SUB A LOOP2
ADD B
DCR E
JNZ LOOP2
MOV B, A
DCR C
JNZ LOOP1
STA 9000H
RST
MOV C, B
DCR C LOOP1
MOV E, C
SUB A LOOP2
ADD B
DCR E
JNZ LOOP2
MOV B, A
DCR C
JNZ LOOP1
STA 9000H
RST
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