#include <iostream>

using namespace std;
using LL = long long;

constexpr LL MOD = 998244353;
LL dp[100001];

int main() {
    int N, K;
    cin >> N >> K;

    dp[0] = 1;
    for (int i = 0; i < N; i++) {
        for (int j = K; j <= N - i; j++) {
            dp[i + j] += dp[i];
            dp[i + j] %= MOD;
        }
    }

    LL ans = 0;
    for (int i = 0; i <= N; i++) {
        ans += dp[i];
        ans %= MOD;
    }

    cout << ans << endl;
}