#include <algorithm>
#include <bitset>
#include <tuple>
#include <cstdint>
#include <cstdio>
#include <cctype>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <limits>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;
long long mod = 998244353;
long long Fibonacci(long long A) {
    vector<long long>B(A + 1); B[0] = 1; B[1] = 1;
    for (int i = 2; i <= A; i++) { B[i] = B[i - 1] + B[i - 2]; B[i] %= mod; }
    return B[A];
}
#define int long long
signed main() {
    int N, M; cin >> N >> M;
    if (N == 1) { cout << 1 << endl; return 0; }
    vector<int>A(M + 1,1);
    for (int i = N; i <= M; i++) {
        A[i] = A[i - N] + A[i - 1];
        A[i]%=mod;
    }
    cout << A[M] << endl;
}