n, m = map(int, input().split())
if (not 1 <= n <= 10 ** 9) or (not 1 <= m <= 10 ** 6):
    exit(print(1 % 0))
mod = 998244353
if n == 1:
    print(1)
elif n > m:
    print(1)
elif n == m:
    print(2)
else:
    a = [1] * (n - 1) + [2]
    for i in range(10 ** 6 + 1):
        a.append((a[-1] + a[-n]) % mod)
    print(a[m - 1])