def main():
    N = int(input())
    nums = [int(i) for i in input().split()]
    sorted_nums = sorted(nums)
    #print(sorted_nums)
    print(get_new_num_count(sorted_nums))

def get_new_num_count(sorted_list):
    ans = 0
    for num in sorted_list:
        count = sorted_list.count(num)
        if count == 1:
            ans += 1
        else:
            return ans
    return ans


if __name__ == '__main__':
    main()