mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

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

    A_sorted = sorted(A)
    if A == A_sorted:
        print(0)
    else:
        ii = -1
        for i in range(1, N):
            if A[i] < A[i-1]:
                if ii != -1:
                    print(2)
                    exit()
                else:
                    ii = i
        if ii == -1:
            print(2)
            exit()
        if A[ii] > A[0]:
            print(2)
            exit()
        for i in range(ii, N-1):
            if A[i] <= A[0] and A[i+1] >= A[ii-1]:
                print(1)
                exit()
        if A[-1] <= A[0]:
            print(1)
            exit()
        print(2)


if __name__ == '__main__':
    main()