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 temp[] = new int[N];
		for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		}
		Arrays.parallelSort(p);
		int count =0;
		for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		}
		if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
} import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util 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 temp[] = new int[N];
		for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		}
		Arrays.parallelSort(p);
		int count =0;
		for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		}
		if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int p[] = new int[N];
		int temp[] = new int[N];
		for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		}
		Arrays.parallelSort(p);
		int count =0;
		for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		}
		if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int p[] = new int[N];
		int temp[] = new int[N];
		for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		}
		Arrays.parallelSort(p);
		int count =0;
		for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		}
		if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int p[] = new int[N]; p new int[N] N int temp[] = new int[N]; temp new int[N] N for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		} int i=0; int i=0; i 0 i<N i N i++ i++ i {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		} {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		} temp[i] = sc.nextInt() temp[i] temp i sc.nextInt() sc.nextInt sc p[i] = temp[i] p[i] p i temp[i] temp i Arrays.parallelSort(p) Arrays.parallelSort Arrays p int count =0; count 0 for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		} int i=0; int i=0; i 0 i<N i N i++ i++ i {
			if (temp[i]!=p[i]) {
				count ++;
			}
		} {
			if (temp[i]!=p[i]) {
				count ++;
			}
		} if (temp[i]!=p[i]) {
				count ++;
			} temp[i]!=p[i] temp[i] temp i p[i] p i {
				count ++;
			} count ++ count if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		} count<=2 count 2 {
			System.out.println("YES");
		} System.out.println("YES") System.out.println System.out System System.out "YES" {
			System.out.println("NO");
		} System.out.println("NO") System.out.println System.out System System.out "NO" String[] args args 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 temp[] = new int[N];
		for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		}
		Arrays.parallelSort(p);
		int count =0;
		for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		}
		if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
} 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 temp[] = new int[N];
		for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		}
		Arrays.parallelSort(p);
		int count =0;
		for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		}
		if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
} Main
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 temp[] = new int[N];
		for (int i=0;i<N;i++) {
			temp[i] = sc.nextInt();
			p[i] = temp[i];
		}
		Arrays.parallelSort(p);
		int count =0;
		for (int i=0;i<N;i++) {
			if (temp[i]!=p[i]) {
				count ++;
			}
		}
		if (count<=2) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
}
