#include<bits/stdc++.h>
using namespace std;
using ll=long long;
int main()
{
    cin.tie(0)->sync_with_stdio(0);
    ll n,m;cin>>n>>m;
    ll sum=0;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            sum+=lcm(i,j);
            sum%=998244353;
        }
    }
    cout<<sum<<endl;
}