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[-1])