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def solution(citations):
    maximum = max(citations)
    citations.sort()
    arr = [0] * (maximum + 1) # Count of Citation of this & above
    arr[maximum] = citations.count(maximum)

    while maximum in citations:
        citations.remove(maximum)

    if(maximum == 0):
        return 0
    for i in reversed(range(maximum)):
        arr[i] = citations.count(i) + arr[i + 1]

        while i in citations:
            citations.remove(i)

        if(arr[i] >= i):
            return i




# 16