import java.util.*;

public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] p = new int[n];
    int[] q = new int[n];

    for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    }

    Arrays.sort(q);

    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    }
    
    System.out.println(cnt > 2 ? "NO" : "YES");
  }
} import java.util.*; util.* java public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] p = new int[n];
    int[] q = new int[n];

    for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    }

    Arrays.sort(q);

    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    }
    
    System.out.println(cnt > 2 ? "NO" : "YES");
  }
} Main public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] p = new int[n];
    int[] q = new int[n];

    for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    }

    Arrays.sort(q);

    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    }
    
    System.out.println(cnt > 2 ? "NO" : "YES");
  } main {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] p = new int[n];
    int[] q = new int[n];

    for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    }

    Arrays.sort(q);

    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    }
    
    System.out.println(cnt > 2 ? "NO" : "YES");
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int[] p = new int[n]; p new int[n] n int[] q = new int[n]; q new int[n] n for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
      p[i] = sc.nextInt();
      q[i] = p[i];
    } {
      p[i] = sc.nextInt();
      q[i] = p[i];
    } p[i] = sc.nextInt() p[i] p i sc.nextInt() sc.nextInt sc q[i] = p[i] q[i] q i p[i] p i Arrays.sort(q) Arrays.sort Arrays q int cnt = 0; cnt 0 for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    } {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    } if (p[i] != q[i]) cnt++; p[i] != q[i] p[i] p i q[i] q i cnt++ cnt if (cnt > 2) break; cnt > 2 cnt 2 break; System.out.println(cnt > 2 ? "NO" : "YES") System.out.println System.out System System.out cnt > 2 ? "NO" : "YES" cnt > 2 cnt 2 "NO" "YES" String[] args args public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] p = new int[n];
    int[] q = new int[n];

    for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    }

    Arrays.sort(q);

    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    }
    
    System.out.println(cnt > 2 ? "NO" : "YES");
  }
} public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] p = new int[n];
    int[] q = new int[n];

    for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    }

    Arrays.sort(q);

    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    }
    
    System.out.println(cnt > 2 ? "NO" : "YES");
  }
} Main
import java.util.*;

public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] p = new int[n];
    int[] q = new int[n];

    for (int i = 0; i < n; i++) {
      p[i] = sc.nextInt();
      q[i] = p[i];
    }

    Arrays.sort(q);

    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (p[i] != q[i]) cnt++;
      if (cnt > 2) break;
    }
    
    System.out.println(cnt > 2 ? "NO" : "YES");
  }
}
