First thanks to natalia problems author ,
I want to comment on this problem,this problem isn't near to reality i now you write in the notes you can start with '0' but from my point of view the problem have to be near to reality
my code pass pretests and unsuccessful hack ,but failed system test because of trickily test cases.
it's reliable to get large things from smaller ones but it's unreliable to get something from nothing.
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