n = int(input())
*a, = map(int,input().split())
v = 10**10
p = [0]*n
for i in range(n)[::-1]:
    if a[i] > v: break
    p[i] = 1
    v = a[i]
v = -1
q = [0]*n
for i in range(n):
    if a[i] < v: break
    q[i] = 1
    v = a[i]
idx = i
v = q[idx]
for i in range(idx,n):
    if a[i] < v: break
    q[i] = 1
    v = a[i]

L,R = q[0],q[idx-1]
ans = 2
for i in range(idx,n):
    if q[i-1] == p[i] == 1 and a[i-1] <= L and R <= a[i]:
        ans = 1

#print(p)
#print(idx,q)
if p[0] == 1:
    ans = 0
print(ans)