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 count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || count == 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }

    }
}

/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