.386
.model flat
option casemap :none

.data

.code
fibonacci:
    push ebp
    mov ebp, esp
    sub esp, 10h


    cmp dword ptr [ebp + 8h], 0h
    je default_0

    cmp dword ptr [ebp + 8h], 1h
    je default_1

    cmp dword ptr [ebp + 8h], 2h
    je default_1


    push dword ptr [ebp + 8h]
    dec dword ptr [esp]

    add eax, ecx
    mov ebx, eax

    mov eax, ecx
    mov ecx, ebx

    call fibonacci

    mov eax, ecx

    jmp ocisti

    default_0:
        mov eax, 0h
        ret

    default_1:
        mov eax, 1h
        ret

    ocisti:
    add esp, 10h
    pop ebp
    retn 4h


_start:

    mov ebx, 1h
    mov ecx, 1h
    mov eax, 1h

    push 0h
    call fibonacci

    ret
end _start