MOD = 998244353
n, m = map(int, input().split())
if n == 1:
    print(1)
else:
    dp = [0] * (m + 1)
    dp[0] = 1
    for i in range(m):
        dp[i] %= MOD
        if i + n <= m:
            dp[i + n] += dp[i]
        dp[i + 1] += dp[i]
    print(dp[m] % MOD)