/* #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>(cout, a); } void pprint() { cout << endl; } template void pprint(Head &&head, Tail &&...tail) { cout << head; if (sizeof...(Tail) > 0) 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((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), cin.tie(nullptr), cout.tie(nullptr); cout << fixed << setprecision(IOS_PREC); if (AUTOFLUSH) cout << unitbuf; } } ATCODER_INITIALIZE; void Yn(bool p) { cout << (p ? "Yes" : "No") << endl; } void YN(bool p) { 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; inline pll divmod(ll dividend, ll modulus) noexcept { assert(modulus > 0); ll q = dividend / modulus; ll r = dividend - q * modulus; if (r < 0) { r += modulus; q -= 1; } return {q, r}; } tuple extgcd(ll a, ll b) { if (b == 0) return {a, 1, 0}; auto [g, x, y] = extgcd(b, a % b); // dump(a, b, g, x, y); return {g, y, x - a / b * y}; } ll mod_linear_equation(ll a, ll b, ll n) { assert(a > 0 && n > 0); auto [d, x, y] = extgcd(a, n); n /= d; return b % d == 0 ? ((b / d * x) % n + n) % n : -1; } template pair> extextgcd(vc &coef) { // search min abs T mi = 0; ll argmi = -1; int nonzero_cnt = 0; REP(i, 0, SIZE(coef)) if (coef[i] != 0) { ++nonzero_cnt; if (argmi == -1 || abs(coef[i]) < abs(mi)) mi = coef[i], argmi = i; } if (nonzero_cnt == 0) { // 任意の整数が解になる return {0, coef}; } if (nonzero_cnt == 1) { vc ans = coef; ans[argmi] = 1; return {mi, ans}; } vc coef_nxt = coef; REP(i, 0, SIZE(coef_nxt)) if (i != argmi) coef_nxt[i] %= mi; auto [g, ans] = extextgcd(coef_nxt); REP(i, 0, SIZE(ans)) if (i != argmi) ans[argmi] -= coef[i] / mi * ans[i]; // dump(coef, g, ans); return {g, ans}; } // ベクトル同士の足し算 template vc operator+(const vc &v0, const vc &v1) { assert(SIZE(v0) == SIZE(v1)); vc ret = v0; REP(i, 0, SIZE(v0)) ret[i] += v1[i]; return ret; } template vc &operator+=(vc &v0, const vc &v1) { assert(SIZE(v0) == SIZE(v1)); REP(i, 0, SIZE(v0)) v0[i] += v1[i]; return v0; } // ベクトル同士の引き算 template vc operator-(const vc &v0, const vc &v1) { assert(SIZE(v0) == SIZE(v1)); vc ret = v0; REP(i, 0, SIZE(v0)) ret[i] -= v1[i]; return ret; } template vc &operator-=(vc &v0, const vc &v1) { assert(SIZE(v0) == SIZE(v1)); REP(i, 0, SIZE(v0)) v0[i] -= v1[i]; return v0; } template vc operator*(const vc &v, const T c) { vc ret = v; REP(i, 0, SIZE(v)) ret[i] *= c; return ret; } template vc &operator*=(vc &v, const T c) { REP(i, 0, SIZE(v)) v[i] *= c; return v; } template pair>> parameterize(vc &coef) { // search min abs T mi = 0; ll argmi = -1; int nonzero_cnt = 0; REP(i, 0, SIZE(coef)) if (coef[i] != 0) { ++nonzero_cnt; if (argmi == -1 || abs(coef[i]) < abs(mi)) mi = coef[i], argmi = i; } if (nonzero_cnt == 0) { // 任意の整数が解になる vc> param(SIZE(coef), vc(SIZE(coef) + 1, 0)); REP(i, 0, SIZE(coef)) param[i][i] = 1; return {0, param}; } if (nonzero_cnt == 1) { vc> param(SIZE(coef), vc(SIZE(coef) + 1, 0)); REP(i, 0, SIZE(coef)) param[i][i] = 1; // vll ans = coef; // ans[argmi] = 1; param[argmi][argmi] = 0; param[argmi][SIZE(coef)] = 1; return {mi, param}; } vc coef_nxt = coef; REP(i, 0, SIZE(coef_nxt)) if (i != argmi) coef_nxt[i] %= mi; auto [g, param] = parameterize(coef_nxt); REP(i, 0, SIZE(param)) if (i != argmi) param[argmi] -= param[i] * (coef[i] / mi); // dump(coef, g, ans); return {g, param}; } template pair>> parameterize_equation(vc &coef, const T c) { auto [g, param] = parameterize(coef); // if (g == 0) { // 任意の整数が解になる return {-2, param}; } if (c % g != 0) { // 解なし return {-1, param}; } // いらない変数が1つあるはずなので削る { ll idx = -1; REP(i, 0, SIZE(coef)) { bool zero = true; REP(j, 0, SIZE(coef)) if (param[j][i] != 0) { zero = false; break; } if (zero) { idx = i; break; } } if (idx != -1) { REP(i, 0, SIZE(coef)) param[i].erase(param[i].begin() + idx); } } // 倍率を掛ける { T a = c / g; // REP(i, 0, SIZE(coef)) param[i] *= a; REP(i, 0, SIZE(coef)) param[i].back() *= a; } return {0, param}; } // Problem void solve() { VAR(ll, n, mt); vll bt(mt), ct(mt); REP(i, 0, mt) cin >> bt[i], ct[i]; vll b, c; REP(i, 0, mt) { if (bt[i] != 1) { b.push_back(bt[i]); c.push_back(ct[i]); } } ll m = SIZE(b); if (m == 0) { pprint(0); return; } REP(i, 0, m) { if (c[i] < 0) { // auto [q, r] = divmod(c[i], b[i]); // c[i] = r; c[i] %= b[i]; } else { c[i] %= b[i]; } if (c[i] < 0) { c[i] += b[i]; } } // dump(b, c); ll cc = c[0]; vll coef = {b[0], 0}; if (cc > n) { pprint("NaN"); return; } REP(i, 1, m) { coef[1] = -b[i]; auto [status, param] = parameterize_equation(coef, c[i] - cc); dump(status, param); if (status == -1) { pprint("NaN"); return; } // y = param[1][0] * k + param[1][1] // = b[i] * (param[1][0] * k + param[1][1]) + c[i] assert(status == 0); assert(SIZE(param) == 2 && SIZE(param[1]) == 2); ll b2 = b[i] * param[1][0]; ll c2 = b[i] * param[1][1] + c[i]; if (c2 < 0) { // auto [q, r] = divmod(c2, b2); // c2 = r; c2 %= b2; } else { c2 %= b2; } if (c2 < 0) { c2 += b2; } cc = c2; coef[0] = b2; if (c2 > n) { // assert(false); pprint("NaN"); // pprint(0); return; } } pprint(cc); } // entry point int main() { solve(); return 0; }