use num::Integer;
use proconio::input;

const MD: u64 = 998244353;

fn solve() -> u64 {
  input! {
    n: u64,
    m: u64,
  }
  let mut ans = 0;
  for a in 1..=n {
    for b in 1..=m {
      ans += a.lcm(&b);
      ans %= MD;
    }
  }
  ans
}

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