#include // created [2019/12/12] 23:52:05 #pragma GCC diagnostic ignored "-Wsign-compare" #pragma GCC diagnostic ignored "-Wsign-conversion" using i32 = int32_t; using i64 = int64_t; using u32 = uint32_t; using u64 = uint64_t; using uint = unsigned int; using usize = std::size_t; using ll = long long; using ull = unsigned long long; using ld = long double; template using arr = T (&)[n]; template using c_arr = const T (&)[n]; template constexpr T popcount(const T u) { return u ? static_cast(__builtin_popcountll(static_cast(u))) : static_cast(0); } template constexpr T log2p1(const T u) { return u ? static_cast(64 - __builtin_clzll(static_cast(u))) : static_cast(0); } template constexpr T msbp1(const T u) { return log2p1(u); } template constexpr T lsbp1(const T u) { return __builtin_ffsll(u); } template constexpr T clog(const T u) { return u ? log2p1(u - 1) : static_cast(u); } template constexpr bool ispow2(const T u) { return u and (static_cast(u) & static_cast(u - 1)) == 0; } template constexpr T ceil2(const T u) { return static_cast(1) << clog(u); } template constexpr T floor2(const T u) { return u == 0 ? static_cast(0) : static_cast(1) << (log2p1(u) - 1); } template constexpr bool btest(const T mask, const usize ind) { return static_cast((static_cast(mask) >> ind) & static_cast(1)); } template void bset(T& mask, const usize ind) { mask |= (static_cast(1) << ind); } template void breset(T& mask, const usize ind) { mask &= ~(static_cast(1) << ind); } template void bflip(T& mask, const usize ind) { mask ^= (static_cast(1) << ind); } template void bset(T& mask, const usize ind, const bool b) { (b ? bset(mask, ind) : breset(mask, ind)); } template constexpr T bcut(const T mask, const usize ind) { return ind == 0 ? static_cast(0) : static_cast((static_cast(mask) << (64 - ind)) >> (64 - ind)); } template bool chmin(T& a, const T& b) { return (a > b ? a = b, true : false); } template bool chmax(T& a, const T& b) { return (a < b ? a = b, true : false); } constexpr unsigned int mod = 1000000007; template constexpr T inf_v = std::numeric_limits::max() / 4; template constexpr Real pi_v = Real{3.141592653589793238462643383279502884}; template T in() { T v; return std::cin >> v, v; } template T in_v(typename std::enable_if<(i == n), c_arr>::type) { return in(); } template auto in_v(typename std::enable_if<(i < n), c_arr>::type& szs) { const usize s = (usize)szs[i]; std::vector(szs))> ans(s); for (usize j = 0; j < s; j++) { ans[j] = in_v(szs); } return ans; } template auto in_v(c_arr szs) { return in_v(szs); } template auto in_t() { return std::tuple...>{in()...}; } struct io_init { io_init() { std::cin.tie(nullptr), std::ios::sync_with_stdio(false); std::cout << std::fixed << std::setprecision(20); } } hogechan; template void out(const T& v) { std::cout << v << '\n'; } // Reactiveではstd::flushを忘れない template void out(const T& v, const Args... args) { std::cout << v << ' ', out(args...); } # define SHOW(...) static_cast(0) constexpr ull TEN(const usize n) { return n == 0 ? 1ULL : TEN(n - 1) * 10ULL; } template auto make_v(typename std::enable_if<(i == n), c_arr>::type, const T& v = T{}) { return v; } template auto make_v(typename std::enable_if<(i < n), c_arr>::type szs, const T& v = T{}) { const usize s = (usize)szs[i]; return std::vector(szs, v))>(s, make_v(szs, v)); } template auto make_v(c_arr szs, const T& t = T{}) { return make_v(szs, t); } template T gcd(const T& a, const T& b) { return a < 0 ? gcd(-a, b) : b < 0 ? gcd(a, -b) : (a > b ? gcd(b, a) : a == 0 ? b : gcd(b % a, a)); } template T lcm(const T& a, const T& b) { return a / gcd(a, b) * b; } template constexpr std::pair extgcd(const T a, const T b) { if (b == 0) { return std::pair{1, 0}; } const auto g = gcd(a, b), da = std::abs(b) / g; const auto p = extgcd(b, a % b); const auto x = (da + p.second % da) % da, y = (g - a * x) / b; return {x, y}; } template constexpr T inverse(const T a, const T mod) { return extgcd(a, mod).first; } template class modint_base { public: template static std::enable_if_t mod() { return mod_ref(); } template static constexpr std::enable_if_t mod() { return mod_value; } template static void set_mod(const std::enable_if_t mod) { mod_ref() = mod, inv_ref() = {1, 1}; } modint_base() : v{0} {} modint_base(const ll val) : v{norm(static_cast(val % static_cast(mod()) + static_cast(mod())))} {} modint_base(const modint_base& n) : v{n()} {} explicit operator bool() const { return v != 0; } bool operator!() const { return not static_cast(*this); } modint_base& operator=(const modint_base& m) { return v = m(), (*this); } modint_base& operator=(const ll val) { return v = norm(uint(val % static_cast(mod()) + static_cast(mod()))), (*this); } friend modint_base operator+(const modint_base& m) { return m; } friend modint_base operator-(const modint_base& m) { return make(norm(mod() - m.v)); } friend modint_base operator+(const modint_base& m1, const modint_base& m2) { return make(norm(m1.v + m2.v)); } friend modint_base operator-(const modint_base& m1, const modint_base& m2) { return make(norm(m1.v + mod() - m2.v)); } friend modint_base operator*(const modint_base& m1, const modint_base& m2) { return make(static_cast(static_cast(m1.v) * static_cast(m2.v) % static_cast(mod()))); } friend modint_base operator/(const modint_base& m1, const modint_base& m2) { return m1 * inv(m2.v); } friend modint_base operator+(const modint_base& m, const ll val) { return modint_base{static_cast(m.v) + val}; } friend modint_base operator-(const modint_base& m, const ll val) { return modint_base{static_cast(m.v) - val}; } friend modint_base operator*(const modint_base& m, const ll val) { return modint_base{static_cast(m.v) * (val % static_cast(mod()))}; } friend modint_base operator/(const modint_base& m, const ll val) { return modint_base{static_cast(m.v) * inv(val)}; } friend modint_base operator+(const ll val, const modint_base& m) { return modint_base{static_cast(m.v) + val}; } friend modint_base operator-(const ll val, const modint_base& m) { return modint_base{-static_cast(m.v) + val}; } friend modint_base operator*(const ll val, const modint_base& m) { return modint_base{static_cast(m.v) * (val % static_cast(mod()))}; } friend modint_base operator/(const ll val, const modint_base& m) { return modint_base{val * inv(static_cast(m.v))}; } friend modint_base& operator+=(modint_base& m1, const modint_base& m2) { return m1 = m1 + m2; } friend modint_base& operator-=(modint_base& m1, const modint_base& m2) { return m1 = m1 - m2; } friend modint_base& operator*=(modint_base& m1, const modint_base& m2) { return m1 = m1 * m2; } friend modint_base& operator/=(modint_base& m1, const modint_base& m2) { return m1 = m1 / m2; } friend modint_base& operator+=(modint_base& m, const ll val) { return m = m + val; } friend modint_base& operator-=(modint_base& m, const ll val) { return m = m - val; } friend modint_base& operator*=(modint_base& m, const ll val) { return m = m * val; } friend modint_base& operator/=(modint_base& m, const ll val) { return m = m / val; } friend modint_base operator^(const modint_base& m, const ll n) { return power(m.v, n); } friend modint_base& operator^=(modint_base& m, const ll n) { return m = m ^ n; } friend bool operator==(const modint_base& m1, const modint_base& m2) { return m1.v == m2.v; } friend bool operator!=(const modint_base& m1, const modint_base& m2) { return not(m1 == m2); } friend bool operator==(const modint_base& m, const ll val) { return m.v == norm(static_cast(static_cast(mod()) + val % static_cast(mod()))); } friend bool operator!=(const modint_base& m, const ll val) { return not(m == val); } friend bool operator==(const ll val, const modint_base& m) { return m.v == norm(static_cast(static_cast(mod()) + val % static_cast(mod()))); } friend bool operator!=(const ll val, const modint_base& m) { return not(m == val); } friend std::istream& operator>>(std::istream& is, modint_base& m) { ll v; return is >> v, m = v, is; } friend std::ostream& operator<<(std::ostream& os, const modint_base& m) { return os << m(); } uint operator()() const { return v; } static modint_base small_inv(const usize n) { auto& in = inv_ref(); if (n < in.size()) { return in[n]; } for (usize i = in.size(); i <= n; i++) { in.push_back(-in[modint_base::mod() % i] * (modint_base::mod() / i)); } return in.back(); } private: template static std::enable_if_t mod_ref() { static UInt mod = 0; return mod; } static uint norm(const uint x) { return x < mod() ? x : x - mod(); } static modint_base make(const uint x) { modint_base m; return m.v = x, m; } static modint_base power(modint_base x, ull n) { modint_base ans = 1; for (; n; n >>= 1, x *= x) { if (n & 1) { ans *= x; } } return ans; } static modint_base inv(const ll v) { return v < 1000000 ? small_inv(static_cast(v)) : modint_base{inverse(v, static_cast(mod()))}; } static std::vector& inv_ref() { static std::vector in{1, 1}; return in; } uint v; }; template using modint = modint_base; template using dynamic_modint = modint_base; template std::vector divisors(const T n) { std::vector head, tail; for (T i = 1; i * i <= n; i++) { if (n % i == 0) { head.push_back(i); if (i * i != n) { tail.push_back(n / i); } } } for (auto it = tail.rbegin(); it != tail.rend(); it++) { head.push_back(*it); } return head; } using mint = dynamic_modint<0>; bool operator<(const mint& m1, const mint& m2) { return m1() < m2(); } int main() { const uint p = in(); mint::set_mod(p); const auto as = in_v({4}); const auto bs = in_v({4}); if (as == bs) { return std::cout << 1 << std::endl, 0; } using mat = std::array, 2>; auto mul = [&](const mat& m1, const mat& m2) { mat ans{{{0, 0}, {0, 0}}}; for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) { for (int k = 0; k < 2; k++) { ans[i][j] += m1[i][k] * m2[k][j]; } } } return ans; }; auto pow = [&](auto&& self, const mat& m, const ll k) { if (k == 0) { return mat{{{1, 0}, {0, 1}}}; } if (k % 2 == 0) { return self(self, mul(m, m), k / 2); } else { return mul(self(self, m, k - 1), m); } }; const auto I = mat{{{1, 0}, {0, 1}}}; auto tr = [&](const mat& m) { return m[0][0] + m[1][1]; }; auto det = [&](const mat& m) { return m[0][0] * m[1][1] - m[0][1] * m[1][0]; }; auto inv = [&](const mat& m) { const mint d = det(m); const mat ans = {{{m[1][1] / d, -m[0][1] / d}, {-m[1][0] / d, m[0][0] / d}}}; assert(mul(ans, m) == I); return ans; }; mat A{{{as[0], as[1]}, {as[2], as[3]}}}; mat B{{{bs[0], bs[1]}, {bs[2], bs[3]}}}; if (det(A) == 0) { if (det(B) != 0) { return std::cout << -1 << std::endl, 0; } const auto at = tr(A); const auto bt = tr(B); mint n = bt / at; const ll k = (n() == 0 ? p : n()); std::cout << (pow(pow, A, k) == B ? k : -1LL) << std::endl; return 0; } if (det(B) == 0) { return std::cout << -1 << std::endl, 0; } const auto ad = det(A); const auto bd = det(B); SHOW(ad, bd); const auto adinv = mint(1) / ad; auto ds = divisors(p - 1); ll period = 0; for (const ll d : ds) { if ((ad ^ d) == 1) { period = d; break; } } const ll BS = 50000; std::map giant; for (ll i = 0; i * BS < period; i++) { const mint p = ad ^ (i * BS); if (giant.count(p()) == 0) { giant[p()] = BS * i; } } auto lg = [&](mint x) { for (ll i = 0; i < BS; i++) { if (giant.count(x())) { return giant[x()] + i; } x *= adinv; } return 0LL; }; const ll n = lg(bd); const auto C = pow(pow, A, p - 1); const auto D = pow(pow, A, n); const auto CINV = inv(C); const auto DINV = inv(D); B = mul(B, DINV); SHOW(B, C, D); std::set ds2; for (const ll d : divisors(p - 1)) { ds2.insert(d); } for (const ll d : divisors(p)) { ds2.insert(d); } for (const ll d : divisors(p)) { ds2.insert(d); } ll p2 = (p - 1) * (p + 1); for (const ll d : ds2) { if (pow(pow, C, d) == I) { p2 = d; break; } } SHOW(p2); assert(pow(pow, C, p2) == I); ll BS2 = 1; for (; BS2 * BS2 < p2; BS2++) {} std::map giant2; for (ll i = 0; i * BS2 < p2; i++) { giant2[pow(pow, C, i * BS2)] = i * BS2; } auto lg2 = [&](mat B) { for (ll i = 0; i < BS2; i++) { if (giant2.count(B)) { const ll q = giant2[B] + i; if (q == 0 and n == 0) { return p2 * (p - 1); } return q * (p - 1) + n; } B = mul(B, CINV); } return inf_v; }; const ll ans = lg2(B); SHOW(ans); std::cout << (ans == inf_v ? -1LL : ans) << std::endl; return 0; }