import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 998244353; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, M = getlist()
	DP = [0] * M
	DP[0] = 1
	for i in range(1, M):
		if i >= N:
			DP[i] = (DP[i - 1] + 2 * DP[i - N]) % con
		else:
			DP[i] = DP[i - 1]

	# print(DP)
	print(DP[-1])

if __name__ == '__main__':
	main()