.text
main:
    li $v0,5
    syscall
    move $a0,$v0

    li $v0,5
    syscall
    move $a1,$v0

    jal funzione
    move $a0,$v0

    li $v0,1
    syscall

    li $v0,10
    syscall

funzione:
    add $t0,$a0,$a1
    bgez $t0,caso_base

    subu $sp,$sp,24
    sw $ra,0($sp)
    sw $a0,4($sp)
    sw $a1,8($sp)

    sub $a0,$a0,2
    add $a1,$a1,3

    jal funzione

    lw $ra,0($sp)
    lw $t1,4($sp)
    lw $t2,8($sp)

    add $sp,$sp,24

    mul $t1,$t1,2
    mul $t2,$t2,3

    sub $t3,$t1,$t2

    add $v0,$v0,$t3
    j fine

fine:
    jr $ra

caso_base:
    li $v0,12
    jr $ra