N, M = map(int, input().split())
mod = 998244353

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

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

print(dp[M])