Problem: Little Petya loves playing with squares. Mum bought him a square 2n × 2n in size. Petya marked a cell inside the square and now he is solving the following task.

The task is to draw a broken line that would go along the grid lines and that would cut the square into two equal parts. The cutting line should not have any common points with the marked cell and the resulting two parts should be equal up to rotation.

Petya wants to determine whether it is possible to cut the square in the required manner given the sizes of the square side and the coordinates of the marked cell. Help him.

Input

The first line contains three space-separated integers 2n, x and y (2 ≤ 2n ≤ 100, 1 ≤ x, y ≤ 2n), representing the length of a square's side and the coordinates of the marked cell. It is guaranteed that 2n is even.

The coordinates of the marked cell are represented by a pair of numbers x y, where x represents the number of the row and y represents the number of the column. The rows and columns are numbered by consecutive integers from 1 to 2n. The rows are numbered from top to bottom and the columns are numbered from the left to the right.

Output

If the square is possible to cut, print "YES", otherwise print "NO" (without the quotes).

Examples

Input

4 1 1


Output

YES


Input

2 2 2


Output

NO

Note

A sample test from the statement and one of the possible ways of cutting the square are shown in the picture: 

<image>

Solution (in JAVA):

Solution:
import java.awt.Point;
import java.io.*;
import java.math.BigInteger;
import java.util.*;

import javax.net.ssl.SSLContext;

import static java.lang.Math.*;

public class Testt {

    final boolean ONLINE_JUDGE = System.getProperty("ONLINE_JUDGE") != null;
    BufferedReader in;
    PrintWriter out;
    StringTokenizer tok = new StringTokenizer("");

    void init() throws FileNotFoundException {
        if (ONLINE_JUDGE) {
            in = new BufferedReader(new InputStreamReader(System.in));
            out = new PrintWriter(System.out);
        } else {
            in = new BufferedReader(new FileReader("input.txt"));
            out = new PrintWriter("output.txt");
        }
    }

    String readString() throws IOException {
        while (!tok.hasMoreTokens()) {
            tok = new StringTokenizer(in.readLine());
        }
        return tok.nextToken();
    }

    int readInt() throws IOException {
        return Integer.parseInt(readString());
    }

    long readLong() throws IOException {
        return Long.parseLong(readString());
    }

    double readDouble() throws IOException {
        return Double.parseDouble(readString());
    }

    public static void mergeSort(int[] a) {
        mergeSort(a, 0, a.length - 1);
    }

    private static void mergeSort(int[] a, int leftIndex, int rightIndex) {
        final int MAGIC_VALUE = 50;
        if (leftIndex < rightIndex) {
            if (rightIndex - leftIndex <= MAGIC_VALUE) {
                insertionSort(a, leftIndex, rightIndex);
            } else {
                int middleIndex = (leftIndex + rightIndex) / 2;
                mergeSort(a, leftIndex, middleIndex);
                mergeSort(a, middleIndex + 1, rightIndex);
                merge(a, leftIndex, middleIndex, rightIndex);
            }
        }
    }

    private static void merge(int[] a, int leftIndex, int middleIndex,
            int rightIndex) {
        int length1 = middleIndex - leftIndex + 1;
        int length2 = rightIndex - middleIndex;
        int[] leftArray = new int[length1];
        int[] rightArray = new int[length2];
        System.arraycopy(a, leftIndex, leftArray, 0, length1);
        System.arraycopy(a, middleIndex + 1, rightArray, 0, length2);
        for (int k = leftIndex, i = 0, j = 0; k <= rightIndex; k++) {
            if (i == length1) {
                a[k] = rightArray[j++];
            } else if (j == length2) {
                a[k] = leftArray[i++];
            } else {
                a[k] = leftArray[i] <= rightArray[j] ? leftArray[i++]
                        : rightArray[j++];
            }
        }
    }

    private static void insertionSort(int[] a, int leftIndex, int rightIndex) {
        for (int i = leftIndex + 1; i <= rightIndex; i++) {
            int current = a[i];
            int j = i - 1;
            while (j >= leftIndex && a[j] > current) {
                a[j + 1] = a[j];
                j--;
            }
            a[j + 1] = current;
        }
    }

    public static void main(String[] args) {
        new Testt().run();
    }

    public void run() {
        try {
            long t1 = System.currentTimeMillis();
            init();
            solve();
            out.close();
            long t2 = System.currentTimeMillis();
            System.err.println("Time = " + (t2 - t1));
        } catch (Exception e) {
            e.printStackTrace(System.err);
            System.exit(-1);
        }
    }

    int mini = Integer.MAX_VALUE;
  //  int maxi = Integer.MIN_VALUE;
    int prime = 0;
    int ans=0;
    int ans2 = 0;
    final double esp = 1e-9;

    // solve!  
   
    void solve() throws IOException {
        
        int n = readInt();
        int x = readInt();
        int y = readInt();
        
        
        
        int a = n/2;
        int b = n/2;
        //22
        int a2 = n/2+1;
        int b2 = n/2;
        //33
        int a3 = n/2+1;
        int b3 = n/2+1;
        //32
        int a4 = n/2;
        int b4 = n/2+1;
        //21
        
        if (x==a && y==b || x==a2 && y==b2 || x==a3 && y==b3 || x==a4 && y==b4 )
         out.print("NO");
        else {
            out.print("YES");
        }
    }
}