source_code: import java.io.*;
  import java.util.*;
  
  public class Solution {
  
  
  	private StringTokenizer st;
  	private BufferedReader in;
  	private PrintWriter out;
  
  	public void solve() throws IOException {
  		int n = nextInt();
  		int[] a = new int[n];
  		for (int i = 0; i < n; ++i) {
  			a[i] = nextInt();
  		}
  		int[] b = a.clone();
  		Arrays.sort(b);
  		int diff = 0;
  		for (int i = 0; i < n; ++i) {
  			if (a[i] != b[i]) {
  				diff++;
  			}
  		}
  		out.println(diff <= 2 ? "YES" : "NO");
  	}
  
  	public void run() throws IOException {
  		in = new BufferedReader(new InputStreamReader(System.in));
  		out = new PrintWriter(System.out);
  		eat("");
  		
  		solve();
  		
  		out.close();
  	}
  	
  	void eat(String s) {
  		st = new StringTokenizer(s);
  	}
  	
  	String next() throws IOException {
  		while (!st.hasMoreTokens()) {
  			String line = in.readLine();
  			if (line == null) {
  				return null;
  			}
  			eat(line);
  		}
  		return st.nextToken();
  	}
  	
  	int nextInt() throws IOException {
  		return Integer.parseInt(next());
  	}
  	
  	long nextLong() throws IOException {
  		return Long.parseLong(next());
  	}
  	
  	double nextDouble() throws IOException {
  		return Double.parseDouble(next());
  	}
  	
  	public static void main(String[] args) throws IOException {
  		Locale.setDefault(Locale.US);
  		new Solution().run();
  	}
  	
  }