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

#主要是比较好想到

def minNumberDisappeared(self , nums: List[int]) -> int:
    hashi = {}
    for i in nums:
        if i not in hashi:
            hashi[i] = 1
    for j in range(1,len(nums)+2):
        if j not in hashi.keys():
            return j
    # write code here