#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param nums int整型一维数组 
# @return int整型
#
class Solution:
    def minNumberDisappeared(self , nums: List[int]) -> int:
        # write code here
        n = max(nums)
        s1 = set(list(range(1,n)))
        ans = s1 - set(nums)
        if len(ans) == 0:
            return n+1
        else:
            return min(ans)