import java.util.Scanner;
import java.util.Arrays;

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

        int n = sc.nextInt();
        int[] a = new int[n];
        String ans = "YES";
        int cnt = 0;

        for (int i = 0; i < n; i++ ) {
            a[i] = sc.nextInt();
        }
        int[] b = Arrays.copyOf(a, n);
        Arrays.sort(b);

        for(int i = 0; i < n; i++ ){
            if (a[i] != b[i]) cnt++;
            if (cnt > 2) {
                ans = "NO";
                break;
            }
        }

        System.out.println(ans);
        
        sc.close();
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz