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line1 = input()
line2 = input()

# no = int(line1)
nums = list(map(int, line2.split(" ")))


from collections import Counter, deque

counts = Counter(nums)
freqs = list(counts.values())
freqs.sort()
freqs = deque(freqs)

no = 0
while len(freqs) > 0:
    cur = freqs.pop()
    cur -= 1
    no += 1
    while len(freqs) > 0 and cur > 0:
        if freqs[0] <= cur:
            cur -= freqs.popleft()
        else:
            freqs[0] -= cur
            cur = 0

print(no)