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

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		int[] array = new int[N];
		int[] array_ = new int[N];
		for (int i = 0; i < N; i++) {
			int current = Integer.parseInt(sc.next());
			array[i] = current;
			array_[i] = current;
		}
		sc.close();
		Arrays.sort(array_);
		int count = 0;
		for (int i = 0; i < N; i++) {
			if (array[i] != array_[i]) {
				count++;
			}
		}
		if (count > 2) {
			System.out.println("NO");
		} else {
			System.out.println("YES");
		}
	}
}
/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