#ifndef MY_HEADER #define MY_HEADER #include #include using namespace std; using namespace atcoder; using lint = long long; using ulint = unsigned long long; using llint = __int128_t; struct edge; using graph = vector>; #define endl '\n' constexpr int INF = 1<<30; constexpr lint INF64 = 1LL<<61; constexpr lint mod107 = 1e9+7; using mint107 = modint1000000007; constexpr long mod = 998244353; using mint = modint998244353; lint ceilDiv(lint x, lint y){if(x >= 0){return (x+y-1)/y;}else{return x/y;}} lint floorDiv(lint x, lint y){if(x >= 0){return x/y;}else{return (x-y+1)/y;}} lint Sqrt(lint x) {assert(x >= 0); lint ans = sqrt(x); while(ans*ans > x)ans--; while((ans+1)*(ans+1)<=x)ans++; return ans;} lint gcd(lint a,lint b){if(a 0){int a = n%10;char b = '0' + a;string c = "";c += b;n /= 10;ans = c + ans;}}return ans;} string toString(lint n, lint k){string ans = toString(n);string tmp = "";while(ans.length() + tmp.length() < k){tmp += "0";}return tmp + ans;} vectorprime;void makePrime(lint n){prime.push_back(2);for(lint i=3;i<=n;i+=2){bool chk = true;for(lint j=0;j= 0; i--) #define vec vector #define pb push_back #define eb emplace_back #define se second #define fi first #define al(x) x.begin(),x.end() #define ral(x) x.rbegin(),x.rend() struct edge{ edge(lint v, lint c = 1) {to = v, cost = c;} lint to; lint cost; }; #endif lint N, M; vec>dp(501, vec(501)); vec>went(501, vec(501, false)); lint f(int n); lint g(int n, int k) { if(k == 1) { return f(n); } if(k > n) return 0; if(k == n) return 1; if(went[n][k]) return dp[n][k]; went[n][k] = true; lint ans = 0; for(int i = 1; i <= n; i++) { ans += f(i) * g(n-i, k-1); ans %= M; } return dp[n][k] = ans; } vecdp2(501); vecwent2(501); lint f(int n) { if(n == 1) return 1; if(went2[n]) return dp2[n]; went2[n] = true; lint ans = 0; for(int k = 1; k <= n-1; k++) { ans += g(n-1, k) * (k+1); ans %= M; } return dp2[n] = ans; } int main(){ cin >> N >> M; if(N%3 != 0) { cout << 0 << endl; return 0; } lint ans = 0; rep(i, N/3) { ans += g(N/3, i+1); ans %= M; } cout << ans << endl; }