#include<bits/stdc++.h>

using namespace std;

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n;
  cin >> n;
  vector<int> a(n);
  for(int i=0;i<n;i++){cin >> a[i];}
  int res=0,pt;
  for(int i=1;i<n;i++){
    if(a[i-1]>a[i]){pt=i;res=2;break;}
  }
  if(res==0){cout << "0\n";return 0;}
  vector<int> b=a;
  sort(b.begin(),b.end());
  while(1){
    if(a[n-1]==b[n-1]){a.pop_back();b.pop_back();n--;}
    else{break;}
  }
  int mi=1000000007;
  for(int i=0;i<n;i++){mi=min(a[i],mi);}
  vector<int> c;
  while(1){
    if(a[pt]==mi){
      for(int i=0;i<n;i++){c.push_back(a[(pt+i)%n]);}
      break;
    }
    pt++;pt%=n;
  }
  if(b==c){cout << "1\n";return 0;}
  cout << "2\n";
  return 0;
}