n, m = map(int, input().split())
mod = 998244353

if n == 1:
    print(1 % mod)
elif m < n:
    print(1 % mod)
else:
    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] % mod)