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

if N == 1:
    print(1)
    exit()

dp = [0] * (M + 2)
dp[0] = 1

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[M])