import sys
input = sys.stdin.readline

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

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

down = [0, 0]

for i in range(N-1):
    down.append(down[-1]+(1 if A[i]>A[i+1] else 0))

M = [0]

for i in range(N):
    M.append(max(M[-1], A[i]))

if down[N]==1:
    print(1)
    exit()

for i in range(N-2, 0, -1):
    if A[i]<=A[i+1]:
        if down[i-1]==1 and M[i]<=A[i]:
            print(1)
            exit()
    else:
        break

print(2)