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def nearest_value(values: set, one: int) -> int:
    a = [(abs(one - n), n) for n in values]
    print(a)
    return min((abs(one - n), n) for n in values)[1]

if __name__ == '__main__':
    print("Example:")
    print(nearest_value({4, 7, 10, 11, 12, 17}, 9))
    # These "asserts" are used for self-checking and not for an auto-testing
    assert nearest_value({4, 7, 10, 11, 12, 17}, 9) == 10
    assert nearest_value({4, 7, 10, 11, 12, 17}, 8) == 7
    assert nearest_value({4, 8, 10, 11, 12, 17}, 9) == 8
    assert nearest_value({4, 9, 10, 11, 12, 17}, 9) == 9
    assert nearest_value({4, 7, 10, 11, 12, 17}, 0) == 4
    assert nearest_value({4, 7, 10, 11, 12, 17}, 100) == 17
    assert nearest_value({5, 10, 8, 12, 89, 100}, 7) == 8
    assert nearest_value({-1, 2, 3}, 0) == -1
    print("Coding complete? Click 'Check' to earn cool rewards!")