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

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();

        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            p[i] = in.nextInt();
        }

        int[] q = Arrays.copyOf(p, n);

        Arrays.sort(p);

        int count = 0;
        for (int i = 0; i < n; i++) {
            if (p[i] != q[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 in = new Scanner(System.in);
        int n = in.nextInt();

        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            p[i] = in.nextInt();
        }

        int[] q = Arrays.copyOf(p, n);

        Arrays.sort(p);

        int count = 0;
        for (int i = 0; i < n; i++) {
            if (p[i] != q[i]) {
                count++;
            }
        }

        if (count <= 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
} Main public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();

        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            p[i] = in.nextInt();
        }

        int[] q = Arrays.copyOf(p, n);

        Arrays.sort(p);

        int count = 0;
        for (int i = 0; i < n; i++) {
            if (p[i] != q[i]) {
                count++;
            }
        }

        if (count <= 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    } main {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();

        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            p[i] = in.nextInt();
        }

        int[] q = Arrays.copyOf(p, n);

        Arrays.sort(p);

        int count = 0;
        for (int i = 0; i < n; i++) {
            if (p[i] != q[i]) {
                count++;
            }
        }

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

        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            p[i] = in.nextInt();
        }

        int[] q = Arrays.copyOf(p, n);

        Arrays.sort(p);

        int count = 0;
        for (int i = 0; i < n; i++) {
            if (p[i] != q[i]) {
                count++;
            }
        }

        if (count <= 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();

        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            p[i] = in.nextInt();
        }

        int[] q = Arrays.copyOf(p, n);

        Arrays.sort(p);

        int count = 0;
        for (int i = 0; i < n; i++) {
            if (p[i] != q[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 in = new Scanner(System.in);
        int n = in.nextInt();

        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            p[i] = in.nextInt();
        }

        int[] q = Arrays.copyOf(p, n);

        Arrays.sort(p);

        int count = 0;
        for (int i = 0; i < n; i++) {
            if (p[i] != q[i]) {
                count++;
            }
        }

        if (count <= 2) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
}
