gauss small
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import sys
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def small_gaussian_sum(n: int) -> int:
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return int((n**2 + n) / 2)
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if __name__ == "__main__":
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if sys.argv.__len__() < 2:
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print("provide a natural number as arg")
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else:
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print(small_gaussian_sum(int(sys.argv[1])))
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