import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static final int MOD = 998244353;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int x = sc.nextInt();
        int y = sc.nextInt();
        int min = Math.min(x, y);
        int max = Math.max(x, y);
        int start;
        if (min == 1) {
            start = 1;
        } else {
            start = min + 1;
        }
        int goal;
        if (max == n) {
            goal = n;
        } else {
            goal = max - 1;
        }
        if (goal < start) {
            System.out.println(0);
            return;
        }
        if (goal - start < 3) {
            System.out.println(1);
            return;
        }
        int[] dp = new int[goal - start + 1];
        dp[0] = 1;
        dp[1] = 1;
        dp[2] = 1;
        for (int i = 3; i < dp.length; i++) {
            dp[i] = (dp[i - 1] + dp[i - 3]) % MOD;
        }
        System.out.println(dp[dp.length - 1]);
    }
}

class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}