mod = 998244353
n, m = map(int, input().split())
if n == 1: exit(print(1))
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])