const MOD: usize = 998244353;

fn main() {
    let mut nxy = String::new();
    std::io::stdin().read_line(&mut nxy).ok();
    let nxy: Vec<usize> = nxy.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nxy[0];
    let x = nxy[1];
    let y = nxy[2];

    let (y, x) = (x.max(y), x.min(y));
    if y - x == 1 && y != n && x != 0 {
        println!("0");
        return;
    }
    let y0 = y - if y == n { 0 } else { 1 };
    let x0 = x + if x == 1 { 0 } else { 1 };
    let diff = y0 - x0;
    let mut dp = vec![0usize; diff+1];
    dp[0] = 1;
    for i in 0..diff {
        dp[i+1] += dp[i];
        if i+3 <= diff {
            dp[i+3] += dp[i];
        }
        dp[i+1] %= MOD;
    }
    println!("{}", dp[diff]);
}