#include<bits/stdc++.h>
#define Gc() getchar() 
#define Me(x,y) memset(x,y,sizeof(x))
#define Mc(x,y) memcpy(x,y,sizeof(x))
#define d(x,y) ((m)*(x-1)+(y))
#define R(n) (rnd()%(n)+1)
#define Pc(x) putchar(x)
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define eb emplace_back
using namespace std;using ll=long long;using db=double;using lb=long db;using ui=unsigned;using ull=unsigned long long;using pii=pair<int,int>;using LL=__int128;
const int N=2e4+5,M=5e5+5,K=(1<<25)+5,mod=998244353,Mod=mod-1;const db eps=1e-9;const int INF=1e9+7;mt19937 rnd(time(0));
int n,p;ll f[N][2],frc[N*2],inv[N*2];
ll calc(int x,int y){return x>=y&&y>=0?frc[x]*inv[x-y]%p:0;}
int main(){
	int i,j,h;scanf("%d%d",&n,&p);
	inv[1]=1;for(i=2;i<=2*n;i++) inv[i]=(p-inv[p%i])*(p/i)%p;
	for(inv[0]=frc[0]=i=1;i<=2*n;i++) frc[i]=frc[i-1]*i%p,inv[i]=inv[i-1]*inv[i]%p;
	f[0][0]=f[0][1]=1;
	for(i=1;i<=n;i++){
		for(j=1;j<=i;j++){
			ll w=calc(2*i-1-j,j-1)*f[i-j][0]%p;
			f[i][1]+=j*w;
			f[i][0]+=w;
			if(j>1){
				w=(j-1)*calc(2*i-1-j,j-2)%p*f[i-j][1]%p;
				f[i][0]+=w;
				f[i][1]+=j*w;
			} 
		}
		f[i][0]%=p;f[i][1]%=p;
	}
	ll tot=1;for(int i=1;i<=n;i++) tot=tot*(i*2-1)%p;
	printf("%lld\n",(tot-f[n][0]+p)%p);
	cerr<<clock()*1.0/CLOCKS_PER_SEC<<'\n';
}