MOD = 998244353
MAX = 10 ** 6 * 2 + 10

fact = [0] * MAX
inv = [0] * MAX

fact[0] = 1
for i in range(1, MAX):
    fact[i] = fact[i - 1] * i % MOD

inv[MAX - 1] = pow(fact[MAX - 1], MOD - 2, MOD)
for i in range(MAX - 1, 0, -1):
    inv[i - 1] = inv[i] * i % MOD

def nPk(n, k):
    return fact[n] * inv[n - k] % MOD

def nCk(n, k):
    return nPk(n, k) * inv[k] % MOD

n, m = map(int, input().split())

ans = 0

for i in range(0, m + 1, n):
    sikiri = i // n
    rest = m - sikiri * n
    ans += nCk(sikiri + rest, sikiri)
    ans %= MOD

print(ans)