import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input())
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

def z_algorithm(s):
    """
    各iについてs[0..n)とs[i..n)のLCP(Longest Common Prefix)の長さを求める
    s: str or (list of int )
    """
    n = len(s)
    if n==0:
        return []
    z = [None]*n
    z[0] = 0
    j = 0
    for i in range(1,n):
        k = 0 if j + z[j] <= i else min(j+z[j]-i, z[i-j])
        z[i] = k
        while i+k<n and s[k]==s[i+k]:
            k += 1
        z[i] = k
        if j+z[j] < i+z[i]:
            j = i
    z[0] = n
    return z

n = int(input())
a = list(map(int, input().split()))
sa = sorted(a)
if a==sa:
    ans = 0
else:
    l = 0
    for r in range(n)[::-1]:
        if a[r]!=sa[r]:
            break
    aa = a[l:r+1] + a[l:r+1]
    bb = sa[l:r+1]
    cc = bb + [-1] + aa
    res = z_algorithm(cc)
    for i in range(len(bb)+1, len(res)):
        if res[i]==len(bb):
            ans = 1
            break
    else:
        ans = 2
print(ans)