n = int(input())
a = list(map(int, input().split()))
n += 1
a.append(1000000001)
cnt = 0
cid = -1
for i in range(n-1):
  if a[i] > a[i+1]:
    cnt += 1
    cid = i
if cnt == 0:
  print(0)
elif cnt == 1:
  done = False
  for i in range(cid, n-1):
    if a[i+1] >= a[cid] and a[0] >= a[i]:
      done = True
      print(1)
      break
  if not done:
    print(2)
else :
  print(2)