n,m = map(int,input().split())
mod = 998244353

d = [0]*(m+1)
d[0] = 1
if n == 1:
    d[-1] = 1
else:
    for i in range(m):
        d[i+1] += d[i]
        d[i+1] %= mod
        if i+n <= m:
            d[i+n] += d[i]
            d[i+n] %= mod
print(d[-1])