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

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 psort[] = new int[N];
		int count = 0;

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

		Arrays.sort(psort);

		for (int i = 0; i < N; i++) {
			if (!(p[i] == psort[i])) {
				count++;
			}
		}

		if (count ==2 || count == 0) {
			System.out.print("YES");
		} else {
			System.out.print("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