#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void*wmem;
char memarr[96000000];
template<class T> inline void walloc1d(T **arr, int x, void **mem = &wmem){
  static int skip[16] = {0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
  (*mem) = (void*)( ((char*)(*mem)) + skip[((unsigned long long)(*mem)) & 15] );
  (*arr)=(T*)(*mem);
  (*mem)=((*arr)+x);
}
template<class T> inline void walloc1d(T **arr, int x1, int x2, void **mem = &wmem){
  walloc1d(arr, x2-x1, mem);
  (*arr) -= x1;
}
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(int x){
  int s=0;
  int m=0;
  char f[10];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
template<class S, class T> inline S moddw_L(S a, const T b){
  a %= b;
  if(a < 0){
    a += b;
  }
  return a;
}
template<class T> void arrRot(int k, int N, T A[], T B[] = NULL, void *mem = wmem){
  int i;
  int fg = 0;
  (k = moddw_L(k,N));
  if(B==NULL){
    walloc1d(&B, N, &mem);
    fg = 1;
  }
  for(i=(k);i<(N);i++){
    B[i-k] = A[i];
  }
  for(i=(0);i<(k);i++){
    B[N-k+i] = A[i];
  }
  if(fg){
    for(i=(0);i<(N);i++){
      A[i] = B[i];
    }
  }
}
int N;
int A[200000];
int main(){
  wmem = memarr;
  int i;
  int j;
  int k;
  rd(N);
  {
    int Lj4PdHRW;
    for(Lj4PdHRW=(0);Lj4PdHRW<(N);Lj4PdHRW++){
      rd(A[Lj4PdHRW]);
    }
  }
  for(i=(1);i<(N);i++){
    if(A[i-1] > A[i]){
      break;
    }
  }
  if(i==N){
    wt_L(0);
    wt_L('\n');
    return 0;
  }
  for(j=(i);j<(N);j++){
    if(A[j] > A[0]){
      break;
    }
  }
  arrRot(i, j, A);
  for(i=(1);i<(N);i++){
    if(A[i-1] > A[i]){
      break;
    }
  }
  if(i==N){
    wt_L(1);
    wt_L('\n');
    return 0;
  }
  wt_L(2);
  wt_L('\n');
  return 0;
}
// cLay version 20210227-1

// --- original code ---
// int N, A[2d5];
// {
//   int i, j, k;
//   rd(N,A(N));
//   rep(i,1,N) if(A[i-1] > A[i]) break;
//   if(i==N) wt(0), return 0;
// 
//   rep(j,i,N) if(A[j] > A[0]) break;
//   arrRot(i, j, A);
//   rep(i,1,N) if(A[i-1] > A[i]) break;
//   if(i==N) wt(1), return 0;
// 
//   wt(2);
// }