use proconio::input;

const MD: i64 = 998244353;
const HALF: i64 = MD / 2 + 1;

fn solve() -> i64 {
  input! {
    n: usize,
    m: usize,
  }
  let mu = mu(n.max(m));
  let mut ans = 0;
  for d in 1..n.max(m) {
    let a = (n / d) as i64;
    let b = (m / d) as i64;
    let mut x = (mu[d] as i64).checked_mul(d as i64).unwrap().checked_mul(d as i64).unwrap();
    x %= MD;
    x *= (a.checked_mul(a + 1).unwrap() % MD).checked_mul(HALF).unwrap() % MD;
    x %= MD;
    x *= (b.checked_mul(b + 1).unwrap() % MD).checked_mul(HALF).unwrap() % MD;
    ans += x;
    ans %= MD;
  }
  ans
}

fn mu(n: usize) -> Vec<i8> {
  let mut t = vec![1; n + 1];
  t[0] = 0;
  let mut p = vec![true; n + 1];
  p[0] = false;
  p[1] = false;
  for k in 2..=n {
    if p[k] {
      for i in 1.. {
        let ki = k.saturating_mul(i);
        if ki > n {
          break;
        }
        p[ki] = false;
        t[ki] *= -1;
        let kki = ki.saturating_mul(k);
        if kki > n {
          continue;
        }
        t[kki] = 0;
      }
    }
  }
  t
}

fn main() {
  let ans = solve();
  println!("{}", ans);
}