Yet Again Need Help With An Exploit

Im still having troubles with this donation box exploit. If anybody could be kind enough to help me with this exploit it would be very helpful

http://pastebin.com/wJLEtmwa

Anything is helpful so please even if your not sure if your right try to make the effort to shine some light!

ur problem is that it checks if u can afford the value ur sending but if its a negative number it returns false so it wont donate money. idk if theres an exploit to be found here

I'm not sure if you're trolling or just autistic. Your lack of grammar and shortening words by 1 letter physically pains me. Please quit MPGH and take your trolling else wear. Also I'm trying just to make it send money in general because it wont when I tried multiple times even when I dimed the box to be where I'm looking.