#include <iostream>

using namespace std;
using ll = long long;
const int MX = 400010;
ll f[MX],inv[MX],fi[MX];
constexpr ll mod = 998244353;
void solve(){
    inv[1] = 1;
    for(int i=2;i<MX;i++){
        inv[i] = mod - (mod/i)*inv[mod%i]%mod;
    }
    f[0] = fi[0] = 1;
    for(int i=1;i<MX;i++){
        f[i] = f[i-1]*i%mod;
        fi[i] = fi[i-1]*inv[i]%mod;
    }
}

ll nck(ll n, ll k){
    if(n<0 || k<0 || n<k) return 0;
    return f[n]*fi[k]%mod*fi[n-k]%mod;
}

ll pw(ll a,ll x){
    ll ret = 1;
    while(x){
        if(x&1) (ret *= a) %= mod;
        (a *= a) %= mod; x /= 2;
    }
    return ret;
}

ll dp[2010][2010] = {};
int main(){
    int i,j,c,x; cin >> c >> x;
    solve();
    if(x==0){
        if(c>0) cout << inv[c + 1] << endl;
        else cout << 0 << endl;
    }
    else if(c>=x){
        cout << inv[x] << endl;
        return 0;
    }else{
        dp[0][0] = 1;
        int las = 0;
        for(i=1;i<=2000;i++){
            if(c + i>x) break;
            for(j=0;j<=x;j++){
                dp[i][j] = inv[c + i]*j%mod*dp[i - 1][j]%mod;
                if(j && (c + i  + 1 - j)>=0) dp[i][j] += inv[c + i]*(c + i + 1 - j)%mod*dp[i - 1][j - 1]%mod;
            }
            las = i;
        }
        ll ans = 0;
        // for(j=0;j<=x;j++){
        //     cout << inv[x - j + 1] << " " << dp[las][j] << endl;
        // }
        for(j=0;j<=x;j++) (ans += inv[x - j + 1]*dp[las][j]%mod) %= mod;
        cout << (mod + 1 - ans)%mod << "\n";
    }
}