import sys
input=lambda: sys.stdin.readline().rstrip()
n,m=map(int,input().split())
mod=998244353
if n>m or n==1:
	print(1)
else:
	A=[0]*m
	for i in range(m):
		if i<n-1:
			A[i]=1
		elif i==n-1:
			A[i]=2
		else:
			A[i]=A[i-1]+A[i-n]
			if A[i]>mod:
				A[i]%=mod
	print(A[-1])