#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)
using mll=atcoder::static_modint<1000000007>;

int N;
vector<int> A;
vector<pair<int,int>> Q;
vector<int> P;

int main(){
  scanf("%d",&N);
  A.resize(N);
  Q.resize(N);
  rep(i,N){ int a; scanf("%d",&a); A[i]=a; Q[i]={a,i}; }
  sort(Q.begin(),Q.end());
  P.resize(N);
  rep(i,N) P[i]=Q[i].second;
  int xp=-1; rep(i,N) if(P[i]!=i) xp=i;
  if(xp==-1){ printf("0\n"); return 0; }
  int ans=1;
  int cinv=0;
  rep(i,xp) if(A[i]>A[i+1]) cinv++;
  if(A[0]<A[xp]) cinv++;
  if(cinv>1) ans=2;
  printf("%d\n",ans);
  return 0;
}