#
# 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
        nums.sort()
        l=[0 for i in range(1,500001)]

        for i in nums:
            if i >0:
                l[i-1]=1
        return l.index(0)+1