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

import sys
if N > M:
    print(1)
    exit()

P = 998244353
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] %= P
print(dp[-1])