import java.util.*;

public class Main{
	public static void main(String args[]) {
		
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] X = new int[N];
		int[] Y = new int[N];
		for(int i = 0; i < N; i++) {
			int input = sc.nextInt();
			X[i] = input;
			Y[i] = input;
		}
		Arrays.sort(X);
		int count = 0;
		for(int i = 0; i < N; i++) {
			if(X[i] != Y[i])count++;
		}
		System.out.println((count <= 2)?"YES":"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