#include <bits/stdc++.h>

using ll = std::int64_t;

int main(){
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    ll N, M;
    std::cin >> N >> M;

    constexpr ll MOD = 998'244'353;
    constexpr ll inv_2 = (MOD + 1) / 2;
    ll sum = (N % MOD) * (M % MOD) % MOD;
    ll q = M / N;
    ll r = N;
    ll l = M / (q + 1);
    while(true){
        sum -= ((l + 1 + r) % MOD) * ((r - l) % MOD) % MOD * inv_2 % MOD * (q % MOD) % MOD;
        if(sum < 0){sum += MOD;}
        if(l == 0){break;}
        q = M / l;
        r = l;
        l = M / (q + 1);
    }

    std::cout << sum << std::endl;
}