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