def main():
    import sys
    input = sys.stdin.read().split()
    n = int(input[0])
    a = list(map(int, input[1:n+1]))
    s = sorted(a)
    
    if a == s:
        print(0)
        return
    
    def is_rotation(a_part, s_part):
        if len(a_part) != len(s_part):
            return False
        if not a_part:
            return True
        first = s_part[0]
        indices = [i for i, x in enumerate(a_part) if x == first]
        for i in indices:
            if a_part[i:] + a_part[:i] == s_part:
                return True
        return False
    
    for j in range(n, 0, -1):
        a_part = a[:j]
        s_part = s[:j]
        if is_rotation(a_part, s_part):
            print(1)
            return
    
    print(2)

if __name__ == "__main__":
    main()