use proconio::input;

fn main() {
    input! {
        n:usize,
        x:usize,
        y:usize,
    }

    let (x, y) = if x < y { (x, y) } else { (y, x) };
    let x = if x == 1 { 0 } else { x };
    let y = if y == n { n + 1 } else { y };
    let d = (y - 1).saturating_sub(x);
    if d == 0 {
        println!("0");
        return;
    }
    let mut dp = vec![0; d];
    dp[0] = 1;
    for i in 0..d.saturating_sub(1) {
        dp[i + 1] += dp[i];
        dp[i + 1] %= MOD;
        if i + 3 < d {
            dp[i + 3] += dp[i];
            dp[i + 3] %= MOD;
        }
    }
    let ans = dp[d - 1];
    println!("{}", ans);
}

const MOD: usize = 998244353;