## https://yukicoder.me/problems/no/1186

MOD = 998244353

def main():
    N, M =  map(int, input().split())

    dp = [0] * (M + 1)
    dp[0] = 1
    for m in range(M + 1):
        dp[m] += dp[m - 1]
        dp[m] %= MOD

        if m - N >= 0:
            dp[m] += dp[m - N]
            dp[m] %= MOD
    
    ans = dp[M]
    print(ans)

if __name__ == "__main__":
    main()