mod = 998244353
def comb(n, r):
    if n < r:return 0
    if n < 0 or r < 0:return 0
    return fa[n] * fi[r] % mod * fi[n - r] % mod
n, m = map(int, input().split())
if n == 1:
    exit(print(1))
fa = [1] * (m + 1)
fi = [1] * (m + 1)
for i in range(1, m + 1):
    fa[i] = fa[i - 1] * i % mod
    fi[i] = pow(fa[i], -1, mod)
ans = 0
for i in range(m // n + 1):
    ans += comb(m - i * (n - 1), i)
    ans %= mod
print(ans % mod)