Unexpected output

[Lorenzo173]

arr=[1,2,3,9]
ip=arr[0]
im=arr[3]
srcfor=ip+im
i=8
while srcfor>=0:
    if srcfor<8:
        ip+=1
        srcfor=ip+im
        if srcfor==i:
            break
    else:
        if srcfor<8:
            im-=1
            srcfor=ip+im
            if srcfor==i:
                break
print (srcfor)

Hi, I'm new of the Forum. The code that you can see at the top of the thread is a my experiment. I was searching to create a code that into an array search a couple of numbers that if sum, the result would be 8. So I tried with some while loops and if statements, but it don't give me any output, Please Help Me.