On the structure of the sumsets

Let A be a set of nonnegative integers. For h≥2h≥2, denote by hAhA the set of all the integers representable by a sum of hh elements from AA. In this paper, we prove that, if k≥3k≥3, and A={a0,a1,…,ak−1}A={a0,a1,…,ak−1} is a finite set of integers such that 0=a0