Problem Statement

Find the number of permutations $P=(P_1,P_2,\dots,P_N)$ of $(1,2,\dots,N)$ that satisfy the following, modulo $998244353$, for each $K=0,1,2,\dots,N-1$.

• There are exactly $K$ integers $i$ such that $1 \le i \le N-1$ and $|P_i - P_{i+1}|=M$.

Constraints

• $2 \le N \le 250000$
• $1 \le M \le N-1$
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

N M

Output

Print the number of permutations that satisfy the condition, modulo $998244353$, for each $K=0,1,2,\dots,N-1$.