Convex hull possesses only integer extreme points

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I have the following question. Consider given natural numbers $ 1 \le l_m <\ldots < l_1 < L $. Is it possible to prove that the convex hull of $ \left\lbrace a \in \mathbb{Z}^m_{\ge 0} \, \middle| \, \sum_{i=1}^m l_ia_i \ge L \right\rbrace $ possesses only integer extreme points? If so, what would be a good idea?