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

using namespace std;
using ll = long long;
using mint = modint998244353;

int main() {
    ll n, m;
    cin >> n >> m;
    
    mint ans = mint(n)*m;
    for (ll i = 1; i <= n; ++i) {
        ll t = m/i;
        ll j = t ? min(m/t, n) : n;
        ans -= mint(j-i+1)*t*(i+j)/2;
        i = j;
    }
    
    cout << ans.val() << '\n';
    
    return 0;
}