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.model tiny
.386
.code
MAX equ 30d;1+2+3+...30=?
start:
mov al,MAX
mov bl,al
inc al
mul bl
shr ax,1
mov cl,100d
div cl
mov dh,al
mov cl,8
shr ax,cl
mov cl,10d
div cl
mov cl,4
shl al,cl
mov dl,al
or dl,ah
mov ax,dx
int 3
mov ax,4c00h
int 21h
end start