Assembly Error, Can't figure out reason why

Question

.386        
.model small,C
.data
.code

AdjustedSum proc uses ebx ecx esi edi   numbers:ptr, used:dword                             ;int AdjustedSum(int numbers[], int used);{

mov ebx, numbers                                                                    ;move base address of array in ebx

mov eax,0                                                                           ;   int AdjustedSum = 0;

AdjustedSum_if1:                                                                        ;   if(used <= 2)
        cmp used, 2
        jg AdjustedSum_if1_end

        ret                                                                             ;       return AdjustedSum;

AdjustedSum_if1_end:

mov esi, [ebx]                                                                          ;   int max = numbers[0];
mov edi,[ebx]                                                                           ;   int min = numbers[0];

mov ecx, 0                                                                              ;   int i = 0;


AdjustedSum_while1:                                                                     ;   while( i < used)    {
cmp ecx, used
jge AdjustedSum_while1_end  


AdjustedSum_if2:                                                                        ;       if(max < numbers[i] )
cmp esi, [ebx+4*ecx]
jge AdjustedSum_if2_end



mov esi, [ebx+4*ecx]                                                                    ;           max = numbers[i];


AdjustedSum_if2_end:

AdjustedSum_if3:                                                                        ;       if(min > numbers[i])
cmp edi, [ebx+4*ecx]
jle AdjustedSum_if3_end

mov edi, [ebx+4*ecx]                                                                    ;           min = numbers[i];

AdjustedSum_if3_end:

add ecx, 1                                                                              ;       i++;

AdjustedSum_while1_end:                                                                 ;   }



mov ecx, 0                                                                              ;   int j = 0;


AdjustedSum_while2:                                                                     ;   while(j < used){
cmp ecx,used
jge AdjustedSum_while2_end


add eax, [ebx+4*ecx]                                                                    ;       AdjustedSum = AdjustedSum + numbers[j];

add ecx,1                                                                                       ;j++;

AdjustedSum_while2_end:                                                                 ;   }



sub eax,edi                                                                               ; AdjustedSum = AdjustedSum - min;
sub eax,esi                                                                             ;   AdjustedSum = AdjustedSum - max;


ret                                                                                     ;   return AdjustedSum;


AdjustedSum endp                                                                        ;}
end

Answer 1

AdjustedSum_if1:
; if(used  numbers[i])
cmp edi, [ebx+4*ecx]

What's the value of ecx the first time through here?