use std::cmp::min;

const DIVISOR: u64 = 998244353;

fn power(base: u64, p: u64) -> u64 {
    if p == 0 { return 1; }
    if p == 1 { return base; }
    let temp = power(base, p/2);
    temp * temp % DIVISOR * power(base, p%2) % DIVISOR
}

fn main() {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<u64> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];

    let mut result: u64 = 0;
    let mut perms: Vec<u64> = vec![1; m as usize + 1usize];
    let mut invs: Vec<u64> = vec![1; m as usize + 1usize];
    for i in 2..=m {
        perms[i as usize] *= perms[i as usize - 1usize] * i % DIVISOR;
        invs[i as usize] = power(perms[i as usize], DIVISOR - 2);
    }
    for i in 0..=m/n {
        let base = (m + i - i * n) as usize;
        let r = min(base - i as usize, i as usize);
        result += perms[base] * invs[base - r] % DIVISOR * invs[r] % DIVISOR;
        result %= DIVISOR;
    }
    println!("{}", result);
}