N = int(raw_input())
input = sorted(raw_input().strip().split())
cnt = 0
while input:
    top = input.pop(0)
    if input:
        nxt = input[0]
        if top == nxt:
            while True:
                try:
                    if input.index(top) == 0:
                        input.remove(top)
                except:
                    break
    else:
        cnt += 1

print cnt