def nearest_value(values: set[int], one: int) -> int:

def nearest_value(values: set[int], one: int) -> int:
    values = set(values)
    values.add(one)
    l = sorted(values)
    return l[l.index(one) - 1] if l.index(one) > 0 else l[l.index(one) + 1]