p=print
n,m=map(int,input().split())
if n==1:p(1)
elif n>m:p(1)
elif n==m:p(2)
else:
 a=[1]*(n-1)+[2]
 for i in range(m):a.append((a[-1]+a[-n])%998244353)
 p(a[m-1])