import sys
def input(): return sys.stdin.readline().strip()
def mapint(): return map(int, input().split())
sys.setrecursionlimit(10**9)

N, M = mapint()
mod = 998244353

dp = [0]*(M+1)
dp[0] = 1
if N==1:
    print(1)
    exit()
for i in range(1, M+1):
    dp[i] = dp[i-1]
    if i>=N:
        dp[i] += dp[i-N]
    dp[i] %= mod

print(dp[-1])