#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353; //1000000007;
using ll=long long;
using pp=pair<ll,ll>;
#define sr string 
#define vc vector
#define fi first
#define se second
#define rep(i,n) for(ll i=0;i<(ll)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
int main(){
  int n;cin>>n;
  vc<int>v(n); rep(i,n)cin>>v[i];
  int x=-1;
  rep(i,n-1)if(v[i]>v[i+1]){
    if(x!=-1){
      cout<<2;
      return 0;
    }
    x=i;
  }
  if(x==-1){
    cout<<0;
    return 0;
  }
  for(int i=x+1;i<n;i++){
    if(v[i]<=v[0])if(i+1==n||v[i+1]>=v[x]){
      cout<<1;
      return 0;
    }
  }
  cout<<2;
}