N, M = map(int, input().split())
if N > M:
    print(1)
else:
    # N<M
    if N == 1:
        print(1)
        exit()
    mod = 998244353
    dp = [0]*(10**6+10)
    dp[0] = 1
    for i in range(1, M+1):
        if i >= N:
            dp[i] = (dp[i-1] + dp[i-N]) % mod
        else:
            dp[i] = dp[i-1]
    print(dp[M])