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This bound improves the previous one $(3-\\frac{1}{p+1})n^2-\\big(1+2p\\binom{2p}{p}\\big)n$ due to Landsberg. Furthermore our bound improves the classic bound $\\frac{5}{2}n^2-3n$, due to Bl\\\"aser, for every $n\\geq 132$. 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