Problem: Snuke loves permutations. He is making a permutation of length N.

Since he hates the integer K, his permutation will satisfy the following:

* Let the permutation be a_1, a_2, ..., a_N. For each i = 1,2,...,N, |a_i - i| \neq K.



Among the N! permutations of length N, how many satisfies this condition?

Since the answer may be extremely large, find the answer modulo 924844033(prime).

Constraints

* 2 ≦ N ≦ 2000
* 1 ≦ K ≦ N-1

Input

The input is given from Standard Input in the following format:


N K


Output

Print the answer modulo 924844033.

Examples

Input

3 1


Output

2


Input

4 1


Output

5


Input

4 2


Output

9


Input

4 3


Output

14


Input

425 48


Output

756765083

Solution (in CPP):

Solution:
#include<cstdio>
#include<algorithm>
#define MOD 924844033
#define MAXN 2006
using namespace std;
int fac[MAXN],vis[MAXN][2],cnt,ed[MAXN*2],d[MAXN*2][MAXN][2],f[MAXN];
long long ans;
int n,k;
int main()
{
	//freopen("captain.in","r",stdin);
	//freopen("captain.out","w",stdout);
	scanf("%d%d",&n,&k);
	fac[0]=1;
	for(int i=1;i<=n;i++)
		fac[i]=1ll*fac[i-1]*i%MOD;
	for(int i=1;i<=n;i++)
		for(int j=0;j<=1;j++)
			if(!vis[i][j])
			{
				int len=0;
				for(int x=i,y=j;x<=n;x+=k,y^=1)
					vis[x][y]=1,len++;
				cnt+=len;
				ed[cnt]=1;
			}
	ed[0]=1;
	d[0][0][0]=1;
	for(int i=0;i<2*n;i++)
		for(int j=0;j<=n;j++)
		{
			d[i+1][j][0]=(d[i][j][0]+d[i][j][1])%MOD;
			if(!ed[i]) d[i+1][j+1][1]=d[i][j][0];
		}
	for(int i=0;i<=n;i++)
		f[i]=(d[n*2][i][0]+d[n*2][i][1])%MOD;
	long long ans=0;
	for(int i=0,j=1;i<=n;j=-j,i++)
		ans=((ans+1ll*f[i]*fac[n-i]*j)%MOD+MOD)%MOD;
	printf("%lld",ans);
}