import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.stream.IntStream;
import java.util.Arrays;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author teiwa
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskB {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.stream.IntStream; IntStream java.util.stream import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskB {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) TaskB solver = new TaskB(); solver new TaskB() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class TaskB {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        }

    } TaskB public void solve(int testNumber, Scanner in, PrintWriter out) {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        } solve {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        } int N = in.nextInt(); N in.nextInt() in.nextInt in int[] array = new int[N]; array new int[N] N for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
                array[i] = in.nextInt();
            } {
                array[i] = in.nextInt();
            } array[i] = in.nextInt() array[i] array i in.nextInt() in.nextInt in int[] answerArray = Arrays.stream(array).sorted().toArray(); answerArray Arrays.stream(array).sorted().toArray() Arrays.stream(array).sorted().toArray Arrays.stream(array).sorted() Arrays.stream(array).sorted Arrays.stream(array) Arrays.stream Arrays array int[] swapArray = Arrays.copyOf(array, N); swapArray Arrays.copyOf(array, N) Arrays.copyOf Arrays array N if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            } Arrays.equals(answerArray, swapArray) Arrays.equals Arrays answerArray swapArray {
                out.println("YES");
                return;
            } out.println("YES") out.println out "YES" return; for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            } {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            } int tmpNum = array[i]; tmpNum array[i] array i for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                } int j = i + 1; int j = i + 1; j i + 1 i 1 j < N j N j++ j++ j {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                } {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                } swapArray[i] = swapArray[j] swapArray[i] swapArray i swapArray[j] swapArray j swapArray[j] = tmpNum swapArray[j] swapArray j tmpNum if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    } Arrays.equals(answerArray, swapArray) Arrays.equals Arrays answerArray swapArray {
                        out.println("YES");
                        return;
                    } out.println("YES") out.println out "YES" return; swapArray[j] = swapArray[i] swapArray[j] swapArray j swapArray[i] swapArray i swapArray[i] = tmpNum swapArray[i] swapArray i tmpNum out.println("NO") out.println out "NO" int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskB {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskB {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.stream.IntStream;
import java.util.Arrays;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author teiwa
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskB {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int N = in.nextInt();
            //List<Integer> list = new ArrayList<>();
            int[] array = new int[N];
            for (int i = 0; i < N; i++) {
                array[i] = in.nextInt();
            }
            //List<Integer> answerList = list.stream().sorted().collect(Collectors.toList());
            int[] answerArray = Arrays.stream(array).sorted().toArray();
            int[] swapArray = Arrays.copyOf(array, N);

            if (Arrays.equals(answerArray, swapArray)) {
                out.println("YES");
                return;
            }

            for (int i = 0; i < N; i++) {
                int tmpNum = array[i];
                for (int j = i + 1; j < N; j++) {
                    swapArray[i] = swapArray[j];
                    swapArray[j] = tmpNum;
                    if (Arrays.equals(answerArray, swapArray)) {
                        out.println("YES");
                        return;
                    }
                    swapArray[j] = swapArray[i];
                    swapArray[i] = tmpNum;
                }
            }
            //System.out.println("NO");
            out.println("NO");
        }

    }
}

