N, M = map(int, input().split())
MOD = 998244353
dp = [0]*(M+1)
dp[0] = 1

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[M])