def kmp_count(string, word):
    # バックトラックテーブルの構築
    # T[i] : word の先頭が string[m] で、
    #        i 番目で不一致だったとき(i.e. string[m + i] != word[i])、
    #        word の先頭を m + i - T[i] にずらす。
    assert len(word) >= 1
    T = [0] * (len(word) + 1)
    T[0] = -1
    i = 2
    j = 0
    while i <= len(word):
        if word[i - 1] == word[j]:
            T[i] = j + 1
            i += 1
            j += 1
        elif j > 0:
            j = T[j]
        else:
            T[i] = 0
            i += 1
    # print(word)
    # print(T)
    # 文字列検索
    m = 0
    i = 0
    ret = 0
    while m + i < len(string):
        if word[i] == string[m + i]:
            i += 1
            if i == len(word):
                ret += 1
                m = m + i - T[i]
                i = T[i]
        else:
            m = m + i - T[i]
            if i > 0:
                i = T[i]
    # print(ret)
    return ret

N = int(input())
As = list(map(int, input().split()))

sAs = sorted(As)

if As == sAs:
    print(0)
else:
    for i in reversed(range(N)):
        if As[i] != sAs[i]:
            break
    if kmp_count(As[:i + 1] * 2, sAs[:i + 1]):
        print(1)
    else:
        print(2)