#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for (int i = 0; i < (n); ++i)

using namespace std;
using mint = modint998244353;

int main() {
    int n, m;
    cin >> n >> m;
    
    mint ans;
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            ans += lcm(i, j);
        }
    }
    
    cout << ans.val() << '\n';
    
    return 0;
}