def main():
    n = int(input())
    a = [int(i) for i in input().split(" ")]
    sorted_a = sorted(a)
    count = 0
    if n >= 3:
        for i in range(1, n - 1):
            if sorted_a[i] != sorted_a[i + 1] and sorted_a[i] != sorted_a[i - 1]:
                count += 1

    if sorted_a[0] != sorted_a[1] or sorted_a[n - 2] != sorted_a[n - 1]:
        count += 1

    print(count)


if __name__ == "__main__":
    main()