#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <ll mod>
struct ModInt {
  ll v;
  ll mod_pow(ll x, ll n) const {
    return (!n) ? 1 : (mod_pow((x * x) % mod, n / 2) * ((n & 1) ? x : 1)) % mod;
  }
  ModInt(ll a = 0) : v(a >= mod ? a % mod : a) {}
  ModInt operator+(const ModInt& b) const {
    return (v + b.v >= mod ? ModInt(v + b.v - mod) : ModInt(v + b.v));
  }
  ModInt operator-(const ModInt& b) const {
    return (v - b.v < 0 ? ModInt(v - b.v + mod) : ModInt(v - b.v));
  }
  ModInt operator*(const ModInt& b) const { return (v * b.v) % mod; }
  ModInt operator/(const ModInt& b) const {
    return (v * mod_pow(b.v, mod - 2)) % mod;
  }
  bool operator==(const ModInt& b) const { return v == b.v; }
  ModInt& operator+=(const ModInt& b) {
    v += b.v;
    if (v >= mod) v -= mod;
    return *this;
  }
  ModInt& operator-=(const ModInt& b) {
    v -= b.v;
    if (v < 0) v += mod;
    return *this;
  }
  ModInt& operator*=(const ModInt& b) {
    (v *= b.v) %= mod;
    return *this;
  }
  ModInt& operator/=(const ModInt& b) {
    (v *= mod_pow(b, mod - 2)) %= mod;
    return *this;
  }
  ModInt pow(ll x) { return ModInt(mod_pow(v, x)); }
  operator int() const { return int(v); }
  operator long long int() const { return v; }
};
template <ll mod>
ostream& operator<<(ostream& out, ModInt<mod> a) {
  return out << a.v;
}
template <ll mod>
istream& operator>>(istream& in, ModInt<mod> a) {
  in >> a.v;
  return in;
}
ll mod_pow(ll n, ll k, ll mod) {
  ll res = 1;
  for (; k > 0; k >>= 1) {
    if (k & 1) (res *= n) %= mod;
    (n *= n) %= mod;
  }
  return res;
}
template <typename NumType>
vector<NumType> get_inv_table(int N, int P) {
  vector<NumType> res;
  for (int i = 0; i < N; i++) {
    res.emplace_back(NumType(mod_pow(i, P - 2, P)));
  }
  return res;
}
template <typename NumType>
struct LagrangePolynomial {
  vector<NumType> x, y, f_table, inv_table;
  bool use_inv_table;
  LagrangePolynomial() : x(), y() {}
  LagrangePolynomial(vector<NumType> x_, vector<NumType> y_, int P = -1)
      : x(x_), y(y_), use_inv_table(P > 0) {
    int N = x.size();
    for (int i = 0; i < N; i++) {
      f_table.emplace_back(f(i, x[i]));
    }
    if (use_inv_table) {
      inv_table = get_inv_table<NumType>(P, P);
    }
  }
  NumType f(int i, NumType p) {
    int N = x.size();
    NumType res(1);
    for (int k = 0; k < N; k++) {
      if (i == k) continue;
      res *= NumType(p - x[k]);
    }
    return res;
  }
  NumType interpolate(NumType p) {
    int N = x.size();
    NumType res(0);
    for (int i = 0; i < N; i++) {
      if (use_inv_table) {
        res += y[i] * f(i, p) * inv_table[int(f_table[i])];
      } else {
        res += y[i] * f(i, p) / f_table[i];
      }
    }
    return res;
  }
};
void ECR065_E() {
  const int MOD = 1000003;
  using mint = ModInt<MOD>;
  const int DEG = 11;
  auto eval_expr = [&](vector<mint>& expr, mint x) {
    mint base(1), res(0);
    for (int i = 0; i < DEG; i++) {
      res += expr[i] * base;
      base *= x;
    }
    return res;
  };
  vector<mint> x, y, expr;
  vector<int> raw_expr = {1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0};
  for (int i = 0; i < DEG; i++) {
    expr.emplace_back(mint(raw_expr[i]));
  }
  for (int i = 1; i <= DEG; i++) {
    x.push_back(mint(i));
    cout << "? " << i << endl;
    int res;
    cin >> res;
    y.push_back(mint(res));
  }
  LagrangePolynomial<mint> lp(x, y, MOD);
  for (int i = 0; i < MOD; i++) {
    if (lp.interpolate(i) == mint(0)) {
      cout << "! " << i << endl;
      return;
    }
  }
  cout << "! " << -1 << endl;
}
int main() {
  ECR065_E();
  return 0;
}
