"""

N*Nの範囲だけ、横向きでも行ける

"""

N,M = map(int,input().split())

if N > M or N == 1:
    print (1)
else:
    dp = [0] * (M+1)
    dp[0] = 1
    mod = 998244353

    for i in range(M):
        dp[i+1] += dp[i]
        dp[i+1] %= mod

        if i+N <= M:
            dp[i+N] += dp[i]
            dp[i+N] %= mod

    print (dp[-1] % mod)