#include <bits/stdc++.h>
using namespace std;

using ll = long long;
constexpr ll mod = 998244353;

int main() {
	int N, M;
	cin >> N >> M;
	
	ll ans = 0;
	for(int a = 1; a <= N; ++a) {
		for(int b = 1; b <= M; ++b) {
			ans += lcm(a, b);
		}
	}
	
	cout << ans % mod << endl;
}