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

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int[] array = new int[n];
		int[] array_sort = new int[n];
		int p;
		int count = 0;
		String str = "YES";
		for (int i = 0; i < n; i++) {
			p = scan.nextInt();
			array[i] = p;
			array_sort[i] = p;
		}
		Arrays.sort(array_sort);
		for (int i = 0; i < n; i++) {
			if (array[i] != array_sort[i]) {
				count++;
				if (count == 3) {
					str = "NO";
					break;
				}
			}
		}
		System.out.println(str);

	}
}

/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