#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (ll i = a; i < b; i++)
using ll = long long;

int main(){
    int n, m;
    cin >> n >> m;
    ll mod = 998244353, ans = 0;
    rep(a, 1, n + 1) rep(b, 1, m + 1) {
        ll lcm = a / __gcd(a, b) * b;
        ans = (ans + lcm) % mod;
    }
    cout << ans << endl;
}