source_code: import java.util.Arrays;
  import java.util.Scanner;
  
  public class test1
  {
  
      public static void main(String[] args)
      {
          Scanner in = new Scanner(System.in);
          int n = in.nextInt();
          int a[]=new int[n];
          int b[]=new int[n];
          for(int i=0;i<n;i++)
          {
              a[i]=in.nextInt();
              b[i]=a[i];
          }
          Arrays.sort(b);
          int count=0;
          for(int i=0;i<n;i++)
              if(a[i]!=b[i])
                  count++;
          if(count<=2)
              System.out.println("YES");
          else
              System.out.println("NO");
      }
      
   
  }