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

fact = [1] * (M + 1)
rfact = [1] * (M + 1)
r = 1
for i in range(1, M + 1):
    fact[i] = r = r * i % MOD
rfact[M] = r = pow(fact[M], MOD - 2, MOD)
for i in range(M, 0, -1):
    rfact[i - 1] = r = r * i % MOD

# nCk (mod MOD) を求める
def comb(n, k):
    return fact[n] * rfact[k] * rfact[n - k] % MOD

a = M // N
ans = 0
# (M-iN+i)C(i)を足し合わせる
for i in range(a + 1):
    ans += comb(M - i * N + i, i)
print(ans)