#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
  }
  vector<int> p;
  for (int i = 0; i < N - 1; i++){
    if (A[i] > A[i + 1]){
      p.push_back(i);
    }
  }
  if (p.empty()){
    cout << 0 << endl;
  } else if (p.size() == 1){
    bool ok = false;
    for (int i = p[0] + 1; i < N - 1; i++){
      if (A[i] <= A[0] && A[p[0]] <= A[i + 1]){
        ok = true;
      }
    }
    if (A[N - 1] <= A[0]){
      ok = true;
    }
    if (ok){
      cout << 1 << endl;
    } else {
      cout << 2 << endl;
    }
  } else {
    cout << 2 << endl;
  }
}