_ = int(input())
numbers = list(map(int, input().split()))
numbers.sort()

flag = 0
counter = 0

for i, num in enumerate(numbers[:-1]):
    
    if num != numbers[i+1] and flag != numbers[i]:
        counter += 1
    else:
        flag = num

if flag != numbers[-1]:
    counter += 1

print(counter)