'''
    Python3(PyPy3) Template for Programming-Contest.

    author : sgsw

    generated : 2021/08/14   
    when : 23:49:30

'''

import sys


def input():
    return sys.stdin.readline().rstrip()


DXY = [(0, -1), (1, 0), (0, 1), (-1, 0)]  # LDRU
mod = 998244353
inf = 1 << 64


def main():
    n = int(input())
    a = list(map(int,input().split()))
    if sorted(a) == a:
        print(0)
    else:
        #case 1
        b = [not a[i] <= a[i + 1] for i in range(n - 1)]
        if sum(b) == 1:
            print(1)
        else:
            print(2)
    return 0


if __name__ == "__main__":
    main()