import 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[] q = new int[n];
        for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        }
        Arrays.sort(q);
        int count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || count == 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }

    }
} import java.util.*; util.* java 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[] q = new int[n];
        for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        }
        Arrays.sort(q);
        int count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || 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[] q = new int[n];
        for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        }
        Arrays.sort(q);
        int count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || 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[] q = new int[n];
        for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        }
        Arrays.sort(q);
        int count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || 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[] q = new int[n]; q new int[n] n for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        } int i= 0; int i= 0; i 0 i<n i n i++ i++ i {
            p[i] = sc.nextInt();
            q[i] = p[i];
        } {
            p[i] = sc.nextInt();
            q[i] = p[i];
        } p[i] = sc.nextInt() p[i] p i sc.nextInt() sc.nextInt sc q[i] = p[i] q[i] q i p[i] p i Arrays.sort(q) Arrays.sort Arrays q int count = 0; count 0 for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        } int i = 0; int i = 0; i 0 i<n i n i++ i++ i {
            if (p[i] != q[i]) count++;
        } {
            if (p[i] != q[i]) count++;
        } if (p[i] != q[i]) count++; p[i] != q[i] p[i] p i q[i] q i count++ count if (count == 0 || count == 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        } count == 0 || count == 2 count == 0 count 0 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[] q = new int[n];
        for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        }
        Arrays.sort(q);
        int count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || 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[] q = new int[n];
        for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        }
        Arrays.sort(q);
        int count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || count == 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }

    }
} Main
import 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[] q = new int[n];
        for (int i= 0;i<n;i++) {
            p[i] = sc.nextInt();
            q[i] = p[i];
        }
        Arrays.sort(q);
        int count = 0;
        for (int i = 0;i<n;i++) {
            if (p[i] != q[i]) count++;
        }
        if (count == 0 || count == 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }

    }
}
