Problem:
Score : 300 points

Problem Statement

Given are an integer X and an integer sequence of length N: p_1, \ldots, p_N.

Among the integers not contained in the sequence p_1, \ldots, p_N (not necessarily positive), find the integer nearest to X, that is, find the integer whose absolute difference with X is the minimum. If there are multiple such integers, report the smallest such integer.

Constraints

1 \leq X \leq 100

0 \leq N \leq 100

1 \leq p_i \leq 100

p_1, \ldots, p_N are all distinct.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

X N
p_1 ... p_N

Output

Print the answer.

Sample Input 1

6 5
4 7 10 6 5

Sample Output 1

8

Among the integers not contained in the sequence 4, 7, 10, 6, 5, the one nearest to 6 is 8.

Sample Input 2

10 5
4 7 10 6 5

Sample Output 2

9

Among the integers not contained in the sequence 4, 7, 10, 6, 5, the ones nearest to 10 are 9 and 11. We should print the smaller one, 9.

Sample Input 3

100 0

Sample Output 3

100

When N = 0, the second line in the input will be empty. Also, as seen here, X itself can be the answer.

Solution in Python (3.8.2) (judge verdict: Wrong Answer)

x, n = map(int, input().split())
a = list(map(int, input().split()))
if (x not in a):
    print(x)
    exit()


tar1 = x
tar2 = x
ff1 = True
ff2 = True

while True:
    if (ff1 is True):
        tar1 -= 1
        if (tar1 not in a):
            print(tar1)
            exit()
        if (tar1 == 0):
            ff1 = False

    if (ff2 is True):
        tar2 += 1
        if (tar2 not in a):
            print(tar2)
            exit()
        if (tar2 == 100):
            ff2 = False

    if ((ff1 is False) and (ff2 is False)):
        break