import sys


def find_closest_number(integers: list[int], value: int) -> int:
    """
    From list of integers, get number closest to a given value
    """
    return min(integers, key=lambda x: abs(x - value))


numbers: list[int] = []
for value in sys.stdin:
    numbers.append(int(value.rstrip('\n')))

given_number = numbers[0]
numbers = numbers[2:]
print(find_closest_number(numbers, given_number))