def main():
    import sys
    input=sys.stdin.readline
    n=int(input())
    a=list(map(int,input().split()))
    
    r=[False]*(n-1)+[True]
    for i in range(n-2,-1,-1):
        r[i]=r[i+1]and(a[i]<=a[i+1])
    
    l=[0]*n
    for i in range(1,n):
        l[i]=l[i-1]+(a[i-1]>a[i])
    
    Max=a[0]
    for i in range(1,n):
        if l[i-1]==1and Max<=a[i]and a[i-1]<=a[0]and r[i]:
            print(1)
            exit(0)
        if Max<a[i]:
            Max=a[i]
    if r[0]:
        print(0)
    elif l[n-1]==1and a[n-1]<=a[0]:
        print(1)
    else:
        print(2)
main()