import sys
input = sys.stdin.readline

from random import randint

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

if A==sorted(A):
    print(0)
    exit()

SA=sorted(A)

while A and A[-1]==SA[-1]:
    A.pop()
    SA.pop()

p=0
rand=randint(10**8,10**9)
mod=10**9+7
q=0
k=1
for i in range(len(A)):
    p=p+SA[i]*k
    q=q+A[i]*k

    if i!=len(A)-1:
        k=k*rand%mod
    p%=mod
    q%=mod

if p==q:
    flag=1
else:
    flag=0
    
for i in range(len(A)-1,-1,-1):
    q-=A[i]*k
    q*=rand
    q+=A[i]
    q%=mod

    if p==q:
        flag=1

if flag:
    print(1)
else:
    print(2)