#include <bits/stdc++.h>
#define int long long
#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)
#define SP << " " <<
#define fish signed
using namespace std;
const int INF = 0x3f3f3f3f3f3f3f3f;
const int N = 8e2 + 10;
int dp[N][N];
int qpow(int a, int b, int p)
{
    int res = 1;
    while(b)
    {
        if(b & 1) res = res * a % p;
        a = a * a % p, b >>= 1;
    } return res;
}
fish main()
{
    // freopen(".in", "r", stdin);
    // freopen(".out", "w", stdout);
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, p; cin >> n >> p;
    dp[1][0] = 1;
    for(int i = 2; i <= n; i ++)
        for(int j = 0; j <= n - i; j ++)
        {
            dp[i][j] = dp[i - 1][0];
            for(int k = 2; k < i; k ++)
                dp[i][j] = (dp[i][j] + dp[i - k][j] * ((dp[k][0] - dp[k][i - 1 - k + j] + p) % p) % p) % p;
            dp[i][j] = dp[i][j] * qpow(i + j - 1, p - 2, p) % p;
        }
    int res = dp[n][0];
    for(int i = 1; i < n; i ++) res = res * i % p;
    cout << res << "\n";
    return 0;
}