def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    n = int(data[0])
    A = list(map(int, data[1:n+1]))
    B = sorted(A)
    
    if A == B:
        print(0)
        return
    
    m = n
    while m > 0 and A[m-1] == B[m-1]:
        m -= 1
    
    if m == 0:
        print(1)
        return
    
    def is_rotation(a, b):
        if len(a) != len(b):
            return False
        if a == b:
            return True
        doubled = b + b
        for i in range(len(b)):
            if doubled[i:i+len(b)] == a:
                return True
        return False
    
    a_part = A[:m]
    b_part = B[:m]
    if is_rotation(a_part, b_part):
        print(1)
    else:
        print(2)

if __name__ == "__main__":
    main()