#include using namespace std; #define int long long #define REP(i, n) for (long long i = 0, max_i = (n); i < max_i; i++) #define REPI(i, a, b) for (long long i = (a), max_i = (b); i < max_i; i++) #define ALL(obj) begin(obj), end(obj) #define RALL(obj) rbegin(obj), rend(obj) #define fi first #define se second using ii = pair; vector dirs = { {1, 0}, {0, 1}, {-1, 0}, {0, -1}, // 4方向 {1, 1}, {-1, 1}, {-1, -1}, {1, -1}, // 斜め {0, 0}, // 自身 }; template inline bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } return false; } template inline bool chmin(T& a, const T& b) { if (a > b) { a = b; return true; } return false; } // debug template ostream& operator<<(ostream& s, vector& d) { REP (i, d.size()) s << d[i] << (i == d.size() - 1 ? "" : " "); return s; } template ostream& operator<<(ostream& s, vector>& d) { REP (i, d.size()) s << d[i] << (i == d.size() - 1 ? "" : "\n"); return s; } template ostream& operator<<(ostream& s, pair& p) { s << "{" << p.first << ", " << p.second << "}"; return s; } template ostream& operator<<(ostream& s, map m) { for (auto it = m.begin(); it != m.end(); it++) { s << *it << (next(it) == m.end() ? "" : "\n"); } return s; } #ifdef _MY_DEBUG #define dump(...) cerr << "/* " << #__VA_ARGS__ << " :[" << __LINE__ << ":" << __FUNCTION__ << "]" << endl, dump_func(__VA_ARGS__), cerr << "*/\n\n"; #else #define dump(...) #define endl "\n" #endif void dump_func() { cerr << endl; } template void dump_func(Head&& h, Tail&&... t) { cerr << h << (sizeof...(Tail) == 0 ? "" : ", "), dump_func(forward(t)...); } struct Fast { Fast() { cin.tie(0); ios::sync_with_stdio(false); } } fast; mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count()); constexpr int MOD = 1000000007; // *************** TEMPLATE END *************** template T pow(T x, int n, const T UNION = 1) { T ret = UNION; while (n) { if (n & 1) ret *= x; x *= x; n >>= 1; } return ret; } template struct ModInt { int x; ModInt() : x(0) {} ModInt(int x_) { if ((x = x_ % MD + MD) >= MD) x -= MD; } ModInt& operator+=(ModInt that) { if ((x += that.x) >= MD) x -= MD; return *this; } ModInt& operator*=(ModInt that) { x = (unsigned long long)x * that.x % MD; return *this; } ModInt& operator-=(ModInt that) { if ((x -= that.x) < 0) x += MD; return *this; } ModInt& operator/=(ModInt that) { x = (unsigned long long)x * that.inv().x % MD; return *this; } ModInt operator-() const { return -x < 0 ? MD - x : -x; } ModInt operator+(ModInt that) const { return ModInt(*this) += that; } ModInt operator*(ModInt that) const { return ModInt(*this) *= that; } ModInt operator-(ModInt that) const { return ModInt(*this) -= that; } ModInt operator/(ModInt that) const { return ModInt(*this) /= that; } bool operator==(ModInt that) const { return x == that.x; } bool operator!=(ModInt that) const { return x != that.x; } ModInt inv() const { return pow(*this, MD - 2); } friend ostream& operator<<(ostream& s, ModInt a) { s << a.x; return s; } friend istream& operator>>(istream& s, ModInt& a) { s >> a.x; return s; } }; using mint = ModInt; // vector fact, fact_inv; // void init_factorial(int n) { // fact = vector(n + 1, 1); // fact_inv = vector(n + 1); // for (int i = 0; i < n; i++) fact[i + 1] = fact[i] * (i + 1); // fact_inv[n] = mint(1) / fact[n]; // for (int i = n - 1; i >= 0; i--) fact_inv[i] = fact_inv[i + 1] * (i + 1); // // for (int i = 0; i < n + 1; i++) assert(fact[i] * fact_inv[i] == 1); // } // mint comb(int n, int r) { // return fact[n] * fact_inv[r] * fact_inv[n - r]; // } int BIG = 1e6; // vector memo; // void hoge() { // mint acc = 1; // REPI (i, 1, 1e9 + 1) { // acc *= i; // if (i % BIG == 0) memo.push_back(acc); // } // cout << "{"; // for (mint x: memo) cout << x << ","; // cout << "};" << endl; // } vector memo = {1, 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mint fact(int n) { mint acc = memo[n / BIG]; int s = BIG * (n / BIG); REPI (i, s + 1, n + 1) { acc *= i; } return acc; } mint comb(int n, int r) { return fact(n) / (fact(r) * fact(n - r)); } signed main() { int n; cin >> n; if (n % 2) { cout << 0 << endl; return 0; } cout << comb(n, n / 2) << endl; }