#yuki1186
n,m=map(int,input().split())
mod=998244353
if n>m or n==1:
 print(1)
 exit()
l=[0]*m
for i in range(m):
 if i<n-1:
  l[i]=1
 elif i==n-1:
  l[i]=2
 else:
  l[i]=l[i-1]+l[i-n]
  l[i]%=mod
print(l[-1])