#include <bits/stdc++.h>
#include <atcoder/modint.hpp>
using namespace std;
using ll = long long;
using mint = atcoder::modint998244353;
int main() {
    ll n,m; cin >> n >> m;
    mint ans = 0;
    for (ll i=1; i<=n; i++) {
        ans += (m % i);
    }
    cout << ans.val() << '\n';
}