#include <iostream>
using namespace std;
using lint = long long;
using ull = unsigned long long;

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

    ull ret = ull(M) * ull(N);

    for (lint k = 1; k <= N;) {
        lint d = M / k;
        if (d == 0) break;
        lint kr = min(M / d, N);

        ull n = kr - k + 1;

        ret -= ull(d) * (n * __int128(k + kr) / 2);

        k = kr + 1;
    }

    cout << ret % 998244353 << '\n';
}