substract 3 numbers input from users . emu 8086

.model small .stack 100h .data m db ? .code main proc mov ah,1 int 21h mov bl,al mov ah,1 int 21h mov bh,al mov ah,1 int 21h mov cl,al sub bl,bh add bl,48 sub bl,cl add bl,48 mov dl,bl mov ah,2 int 21h main endp end