#include<bits/stdc++.h>

#define ll long long
#define pi pair<int,int>
#define vi vector<int>
#define cpy(x,y,s) memcpy(x,y,sizeof(x[0])*(s))
#define mset(x,v,s) memset(x,v,sizeof(x[0])*(s))
#define all(x) begin(x),end(x)
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define ary array
#define eb emplace_back
#define IL inline

using namespace std;

#define N 1001

int mod;

IL int pls(int x,int y){return (x+y>=mod?x+y-mod:x+y);}
IL int sub(int x,int y){return (x-y<0?x-y+mod:x-y);}
IL void Add(int &x,int y){x=pls(x,y);}
IL void Dec(int &x,int y){x=sub(x,y);}
IL int mul(int x,int y){return x*1ll*y%mod;}

int inv[N],fac[N];
IL void init(){
    inv[1]=1;fac[0]=1;
    for(int i=1;i<N;i++)fac[i]=mul(fac[i-1],i);
    for(int i=2;i<N;i++)inv[i]=mul((mod-mod/i),inv[mod%i]);
}


int read(){
    int x=0,f=1;char ch=getchar();
    while(ch<'0' || ch>'9')f=(ch=='-'?-1:f),ch=getchar();
    while(ch>='0' && ch<='9')x=(x<<1)+(x<<3)+(ch^48),ch=getchar();
    return x*f;
}
void write(int x){
    if(x<0)x=-x,putchar('-');
    if(x/10)write(x/10);
    putchar(x%10+'0');
}

int f[N][N];

int main(){
    #ifdef EAST_CLOUD
    freopen("a.in","r",stdin);
    //freopen("a.out","w",stdout);
    #endif

    int n=read();mod=read();
    f[1][0]=1;init();
    for(int i=2;i<=n;i++){
        for(int j=0;j+i<=n;j++){
            f[i][j]=f[i-1][0];
            for(int k=2;k<=i-2;k++){
                Add(f[i][j],mul(sub(f[k][0],f[k][i-k-1+j]),f[i-k][j]));
            }
            f[i][j]=mul(f[i][j],inv[i+j-1]);
        }
    }
    write(mul(f[n][0],fac[n-1]));
    return 0;
}