/* #region Head */ // #include #include #include #include #include // assert.h #include // math.h #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using ll = long long; using ull = unsigned long long; using ld = long double; using pll = pair; template using vc = vector; template using vvc = vc>; using vll = vc; using vvll = vvc; using vld = vc; using vvld = vvc; using vs = vc; using vvs = vvc; template using um = unordered_map; template using pq = priority_queue; template using pqa = priority_queue, greater>; template using us = unordered_set; #define TREP(T, i, m, n) for (T i = (m), i##_len = (T)(n); i < i##_len; ++(i)) #define TREPM(T, i, m, n) for (T i = (m), i##_max = (T)(n); i <= i##_max; ++(i)) #define TREPR(T, i, m, n) for (T i = (m), i##_min = (T)(n); i >= i##_min; --(i)) #define TREPD(T, i, m, n, d) for (T i = (m), i##_len = (T)(n); i < i##_len; i += (d)) #define TREPMD(T, i, m, n, d) for (T i = (m), i##_max = (T)(n); i <= i##_max; i += (d)) #define REP(i, m, n) for (ll i = (m), i##_len = (ll)(n); i < i##_len; ++(i)) #define REPM(i, m, n) for (ll i = (m), i##_max = (ll)(n); i <= i##_max; ++(i)) #define REPR(i, m, n) for (ll i = (m), i##_min = (ll)(n); i >= i##_min; --(i)) #define REPD(i, m, n, d) for (ll i = (m), i##_len = (ll)(n); i < i##_len; i += (d)) #define REPMD(i, m, n, d) for (ll i = (m), i##_max = (ll)(n); i <= i##_max; i += (d)) #define REPI(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++) #define REPIR(itr, ds) for (auto itr = ds.rbegin(); itr != ds.rend(); itr++) #define ALL(x) begin(x), end(x) #define SIZE(x) ((ll)(x).size()) #define ISIZE(x) ((int)(x).size()) #define PERM(c) \ sort(ALL(c)); \ for (bool c##p = 1; c##p; c##p = next_permutation(ALL(c))) #define UNIQ(v) v.erase(unique(ALL(v)), v.end()); #define CEIL(a, b) (((a) + (b)-1) / (b)) #define endl '\n' constexpr ll INF = 1'010'000'000'000'000'017LL; constexpr int IINF = 1'000'000'007LL; constexpr ll MOD = 1'000'000'007LL; // 1e9 + 7 // constexpr ll MOD = 998244353; constexpr ld EPS = 1e-12; constexpr ld PI = 3.14159265358979323846; template istream &operator>>(istream &is, vc &vec) { // vector 入力 for (T &x : vec) is >> x; return is; } template ostream &operator<<(ostream &os, const vc &vec) { // vector 出力 (for dump) os << "{"; REP(i, 0, SIZE(vec)) os << vec[i] << (i == i_len - 1 ? "" : ", "); os << "}"; return os; } template ostream &operator>>(ostream &os, const vc &vec) { // vector 出力 (inline) REP(i, 0, SIZE(vec)) os << vec[i] << (i == i_len - 1 ? "\n" : " "); return os; } template istream &operator>>(istream &is, array &arr) { // array 入力 REP(i, 0, SIZE(arr)) is >> arr[i]; return is; } template ostream &operator<<(ostream &os, const array &arr) { // array 出力 (for dump) os << "{"; REP(i, 0, SIZE(arr)) os << arr[i] << (i == i_len - 1 ? "" : ", "); os << "}"; return os; } template istream &operator>>(istream &is, pair &pair_var) { // pair 入力 is >> pair_var.first >> pair_var.second; return is; } template ostream &operator<<(ostream &os, const pair &pair_var) { // pair 出力 os << "(" << pair_var.first << ", " << pair_var.second << ")"; return os; } // map, um, set, us 出力 template ostream &out_iter(ostream &os, const T &map_var) { os << "{"; REPI(itr, map_var) { os << *itr; auto itrcp = itr; if (++itrcp != map_var.end()) os << ", "; } return os << "}"; } template ostream &operator<<(ostream &os, const map &map_var) { return out_iter(os, map_var); } template ostream &operator<<(ostream &os, const um &map_var) { os << "{"; REPI(itr, map_var) { auto [key, value] = *itr; os << "(" << key << ", " << value << ")"; auto itrcp = itr; if (++itrcp != map_var.end()) os << ", "; } os << "}"; return os; } template ostream &operator<<(ostream &os, const set &set_var) { return out_iter(os, set_var); } template ostream &operator<<(ostream &os, const us &set_var) { return out_iter(os, set_var); } template ostream &operator<<(ostream &os, const pq &pq_var) { pq pq_cp(pq_var); os << "{"; if (!pq_cp.empty()) { os << pq_cp.top(), pq_cp.pop(); while (!pq_cp.empty()) os << ", " << pq_cp.top(), pq_cp.pop(); } return os << "}"; } // tuple 出力 template ostream &operator<<(ostream &os, tuple &a) { if constexpr (N < std::tuple_size_v>) { os << get(a); if constexpr (N + 1 < std::tuple_size_v>) { os << ' '; } else if constexpr (end_line) { os << '\n'; } return operator<< (os, a); } return os; } template void print_tuple(tuple &a) { operator<< <0, true>(std::cout, a); } void pprint() { std::cout << endl; } template void pprint(Head &&head, Tail &&...tail) { std::cout << head; if (sizeof...(Tail) > 0) std::cout << ' '; pprint(move(tail)...); } // dump #define DUMPOUT cerr void dump_func() { DUMPOUT << endl; } template void dump_func(Head &&head, Tail &&...tail) { DUMPOUT << head; if (sizeof...(Tail) > 0) DUMPOUT << ", "; dump_func(move(tail)...); } // chmax (更新「される」かもしれない値が前) template > bool chmax(T &xmax, const U &x, Comp comp = {}) { if (comp(xmax, x)) { xmax = x; return true; } return false; } // chmin (更新「される」かもしれない値が前) template > bool chmin(T &xmin, const U &x, Comp comp = {}) { if (comp(x, xmin)) { xmin = x; return true; } return false; } // ローカル用 #ifndef ONLINE_JUDGE #define DEBUG_ #endif #ifndef MYLOCAL #undef DEBUG_ #endif #ifdef DEBUG_ #define DEB #define dump(...) \ DUMPOUT << " " << string(#__VA_ARGS__) << ": " \ << "[" << to_string(__LINE__) << ":" << __FUNCTION__ << "]" << endl \ << " ", \ dump_func(__VA_ARGS__) #else #define DEB if (false) #define dump(...) #endif #define VAR(type, ...) \ type __VA_ARGS__; \ assert((std::cin >> __VA_ARGS__)); template istream &operator,(istream &is, T &rhs) { return is >> rhs; } template ostream &operator,(ostream &os, const T &rhs) { return os << ' ' << rhs; } struct AtCoderInitialize { static constexpr int IOS_PREC = 15; static constexpr bool AUTOFLUSH = false; AtCoderInitialize() { ios_base::sync_with_stdio(false), std::cin.tie(nullptr), std::cout.tie(nullptr); std::cout << fixed << setprecision(IOS_PREC); if (AUTOFLUSH) std::cout << unitbuf; } } ATCODER_INITIALIZE; void Yn(bool p) { std::cout << (p ? "Yes" : "No") << endl; } void YN(bool p) { std::cout << (p ? "YES" : "NO") << endl; } template constexpr void operator--(vc &v, int) noexcept { for (int i = 0; i < ISIZE(v); ++i) v[i]--; } template constexpr void operator++(vc &v, int) noexcept { for (int i = 0; i < ISIZE(v); ++i) v[i]++; } /* #endregion */ // #include // using namespace atcoder; /* #region mint */ // 自動で MOD を取る整数 template struct mint { ll x; constexpr mint(ll x = 0) : x((x % MOD + MOD) % MOD) {} constexpr mint &operator+=(const mint &a) { if ((x += a.x) >= MOD) x -= MOD; return *this; } constexpr mint &operator-=(const mint &a) { if ((x += MOD - a.x) >= MOD) x -= MOD; return *this; } constexpr mint &operator*=(const mint &a) { (x *= a.x) %= MOD; return *this; } constexpr mint operator+(const mint &a) const { mint res(*this); return res += a; } constexpr mint operator-(const mint &a) const { mint res(*this); return res -= a; } constexpr mint operator*(const mint &a) const { mint res(*this); return res *= a; } // O(log(t)) constexpr mint pow_rec(ll t) const { if (!t) return 1; mint a = pow(t >> 1); // ⌊t/2⌋ 乗 a *= a; // ⌊t/2⌋*2 乗 if (t & 1) // ⌊t/2⌋*2 == t-1 のとき a *= *this; // ⌊t/2⌋*2+1 乗 => t 乗 return a; } constexpr mint pow(ll t) const { mint a(*this); mint res = 1; while (t) { if (t & 1) res *= a; t >>= 1, a *= a; } return res; } // for prime mod constexpr mint inv_prime() const { return pow(MOD - 2); // オイラーの定理から, x^(-1) ≡ x^(p-2) } constexpr mint inv() const { ll a = this->x, b = MOD, u = 1, v = 0, t = 0; mint res; while (b) { t = a / b; a -= t * b; swap(a, b); u -= t * v; swap(u, v); } if (u < 0) u += MOD; res = u; return res; } constexpr mint &operator/=(const mint &a) { return (*this) *= a.inv(); } constexpr mint operator/(const mint &a) const { mint res(*this); return res /= a; } constexpr bool operator==(const mint &a) const { return this->x == a.x; } constexpr bool operator==(const ll a) const { return this->x == a; } constexpr bool operator!=(const mint &a) const { return this->x != a.x; } constexpr bool operator!=(const ll a) const { return this->x != a; } mint operator+() const { return *this; } mint operator-() const { return *this * (-1); } // mint 入力 friend istream &operator>>(istream &is, mint &x) { is >> x.x; return is; } // mint 出力 friend ostream &operator<<(ostream &os, const mint x) { os << x.x; return os; } }; /* #endregion */ /* #region Mat */ template constexpr bool false_v = false; // 行列,==, !=, [] あたりは vector と一緒 template class Mat : public vc> { public: // using vc>::vector; size_t h, w; // コンストラクタ Mat(const size_t h, size_t w) : vc>(h, vc(w, 0)), h(h), w(w) {} // Mat(const Mat &mt) : vc>(mt), h(mt.h), w(mt.w) {} Mat(std::initializer_list> init) : vc>() { for (auto iter = init.begin(); iter != init.end(); ++iter) this->emplace_back(*iter); h = this->size(), w = (*this)[0].size(); } // 行列に別の行列を足す Mat &operator+=(const Mat &another) { assert(this->h == another.h && this->w == another.w); REP(i, 0, this->h) REP(j, 0, this->w)(*this)[i][j] += another[i][j]; return *this; } // 行列から別の行列を引く Mat &operator-=(const Mat &another) { assert(this->h == another.h && this->w == another.w); REP(i, 0, this->h) REP(j, 0, this->w)(*this)[i][j] -= another[i][j]; return *this; } // 行列に別の行列を右から掛ける Mat &operator*=(const Mat &another) { assert(w == another.h); Mat ret(this->h, another.w); REP(i, 0, this->h) REP(j, 0, another.w) REP(k, 0, this->w) ret[i][j] += (*this)[i][k] * another[k][j]; *this = ret; return *this; } // 行列に別の行列を足す Mat operator+(const Mat &another) const { Mat ret(*this); return ret += another; } // 行列から別の行列を引く Mat operator-(const Mat &another) const { Mat ret(*this); return ret -= another; } // 行列に別の行列を右から掛ける Mat operator*(const Mat &another) const { Mat ret(*this); return ret *= another; } // 行列の n 乗を計算する Mat pow(ll n) const { assert(this->h == this->w); Mat ret(this->h, this->w); Mat a(*this); REP(i, 0, this->h) ret[i][i] = 1; while (n) { if (n & 1) ret = a * ret; a = a * a, n >>= 1; } return ret; } template Mat assign(T... nums) { vc num_list = vc{nums...}; assert(num_list.size() == this->h * this->w); REP(i, 0, this->h) REP(j, 0, this->w)(*this)[i][j] = num_list[this->w * i + j]; return *this; } void fill(Num num) { REP(i, 0, this->h) REP(j, 0, this->w)(*this)[i][j] = num; } void print() { REP(i, 0, h) REP(j, 0, w) cout << (*this)[i][j] << (j == (ll)w - 1 ? '\n' : ' '); } }; /* #endregion */ struct Sieve { int n; int sqrtn; vc sieve; // sieve[i] := i の最小の素因数 // コンストラクタ.前処理を行う. Sieve(int n) : n(n), sqrtn((int)sqrtl(n)), sieve(n + 1) { iota(ALL(sieve), 0); // 各要素をインデックスで初期化(0, 1, ..., n).使用するのは 2, 3, ... REPM(i, 2, sqrtn) { if (sieve[i] < i) continue; // i は合成数 // assert(i は素数) sieve[i] = i; // n 以下の任意の i の倍数 j について,j が i 未満の素数で割れなかった場合 REPMD(j, i * i, n, i) if (sieve[j] == j) sieve[j] = i; // j の最小の素因数は i } } // 素因数分解クエリ,O(log n) vc pfd(int m) const { assert(m <= n); vc prime_factors; while (m > 1) { prime_factors.push_back(sieve[m]); m /= sieve[m]; } return prime_factors; } // 素因数分解クエリ,O(log n) map pfd_map(int m) const { assert(m <= n); map prime_factors; // while (m > 1) { prime_factors[sieve[m]]++; m /= sieve[m]; } return prime_factors; } // m が素数かどうかを返す bool is_prime(const int m) const { return sieve[m] == m; // } // n 以下の素数一覧を返す vc primes() const { vc ret; REPM(i, 2, n) if (is_prime(i)) ret.push_back(i); return ret; } // a の約数を列挙する vc devisors(const int a) const { assert(a <= n); map mp = pfd_map(a); vc> V; // mp をベクトルに変換したもの for (auto pa : mp) { V.push_back(pa); } // 戻り値(入れ物) vc Y; auto dfsd = [&Y, &V](auto &&dfsd, int cur_idx, int cur_val) -> void { if (cur_idx == (int)V.size()) { // 値が完成 Y.push_back(cur_val); return; } const auto [v, c] = V[cur_idx]; // p乗を全通り試す (0, ..., p乗) int mul = 1; REP(p, 0, c + 1) { dfsd(dfsd, cur_idx + 1, cur_val * mul); mul *= v; } return; }; dfsd(dfsd, 0, 1); sort(ALL(Y)); return Y; } }; // Problem void solve() { VAR(ll, n, k); // Sieve sieve(n + 2); map pfactors = sieve.pfd_map(n); int max_prime_factor = pfactors.rbegin()->first; if (max_prime_factor == 2) { max_prime_factor = 3; } // 使うかもしれない素数を列挙する vc primes = sieve.primes(); while (primes.size() && primes.back() > max_prime_factor) { primes.pop_back(); } // dump(SIZE(primes)); // 到達し得ない素数は除外する vc visited(primes.size(), 0); auto dfs = [&](auto &&dfs, const int idx) -> void { if (visited[idx]) return; visited[idx] = 1; // next map cur_pfactors = sieve.pfd_map(primes[idx]); // 素因数ごとに見る // dump(idx, primes[idx], cur_pfactors); for (auto [p, a] : cur_pfactors) { // p は素数なので, p+1 は p>3 なら必ず合成数 map nxt_pfactors = sieve.pfd_map(p + 1); // dump(p, p + 1, nxt_pfactors); for (auto [np, na] : nxt_pfactors) { const int nxt_idx = lower_bound(ALL(primes), np) - primes.begin(); // dump(np, primes, nxt_idx); dfs(dfs, nxt_idx); } } }; for (auto [p, a] : pfactors) { const int idx = lower_bound(ALL(primes), p) - primes.begin(); // dump(idx); dfs(dfs, idx); } // dump(primes); // dump(visited); // dump(accumulate(ALL(visited), 0)); vc primes_to_use; REP(i, 0, SIZE(primes)) { if (visited[i]) { primes_to_use.push_back(primes[i]); } } ll SZ = SIZE(primes_to_use); // 推移行列を用意する using mat = Mat>; mat A(SZ, SZ); REP(i, 0, SZ) { const int p = primes_to_use[i]; map cur_pfactors = sieve.pfd_map(p + 1); // dump(p, cur_pfactors); for (auto [np, na] : cur_pfactors) { const int next_idx = lower_bound(ALL(primes_to_use), np) - primes_to_use.begin(); A[next_idx][i] = na; } } // dump(primes_to_use); // A.print(); mat x(SZ, 1); for (const auto [p, a] : pfactors) { const int idx = lower_bound(ALL(primes_to_use), p) - primes_to_use.begin(); x[idx][0] = a; } // x.print(); mat y = A.pow(k) * x; // y.print(); mint ans = 1; REP(i, 0, SZ) { if (y[i][0] == 0) continue; const int p = primes_to_use[i]; ans *= mint(p).pow(y[i][0].x); } pprint(ans); } // entry point int main() { solve(); return 0; }