#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

const ll MAX = 510000;
ll fac[MAX], finv[MAX], inv[MAX];
 
void cominit(){
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for(ll i=2; i<MAX; i++){
        fac[i] = fac[i-1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD/i) % MOD;
        finv[i] = finv[i-1] * inv[i] % MOD;
    }
}
 
ll com(ll n, ll k){
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n-k] % MOD) % MOD;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    ll N, L, U;
    cin >> N >> L >> U;

    cominit();
    ll ans = 0;
    for(ll i=L+N; i<=U+N; i++){
        if(i < U+2){
            ans = (ans + com((N-1)+i, i))%MOD;
        }else{
            ll sa = (com((N-1)+i, i) - com((N-1)+i, i-(U+2))+MOD)%MOD;
            ans = (ans + sa)%MOD;
        }
    }

    cout << ans << endl;
}