#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll MOD = 998244353;

int main(){
    int N, M;
    cin >> N >> M;

    ll ans = 0;
    for (int i = 1; i <= N; i++){
        for (int j = 1; j <= M; j++){
            ans = (ans+lcm(i, j))%MOD;
        }
    }

    cout << ans << endl;
}