MOD = 998244353

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

dp = [0] * (M + 1)
dp[0] = 1

for i in range(1, M + 1):
    dp[i] = dp[i-1]
    if i >= N:
        dp[i] += dp[i - N]
    dp[i] %= MOD

print(dp[M])