N = int(raw_input())
input = sorted(map(int, raw_input().strip().split()))
cnt = 0
top = input.pop()
nxt = input.pop()
while True:
    if top == nxt:
        while top == nxt:
            if len(input) == 0:
                break
            nxt = input.pop()
    else:
        cnt += 1
    
    top = nxt
    nxt = input.pop()

print cnt