#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <atcoder/modint>

using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

const i64 INF = 1001001001001001001;
using Modint = atcoder::static_modint<998244353>;

int main(){
    int C, X; cin >> C >> X;
    if(X == 0){
        Modint ans = Modint(C+1).inv();
        cout << ans.val() << '\n';
        return 0;
    }
    vector<Modint> dp0(X+1);
    dp0[X] = 1;
    for(int i=C+1; i<=X; i++){
        Modint per = Modint(i).inv();
        for(int j=0; j<X; j++){
            auto mv = dp0[j+1] * (per * (i-(X-j-1)));
            dp0[j] += mv;
            dp0[j+1] -= mv;
        }
    }
    Modint ans = 1;
    rep(i,X+1) ans -= dp0[i] / (i+1);
    cout << ans.val() << '\n';
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;