#include <bits/stdc++.h>
using namespace std;
const long long mod = 1000003;
long long modPow(long long a, long long b) {
  long long ret = 1;
  while (b) {
    if (b & 1) (ret *= a) %= mod;
    (a *= a) %= mod;
    b >>= 1;
  }
  return ret;
}
void GaussMod(vector<vector<long long> > &a) {
  int n = a.size();
  int m = a[0].size();
  for (int i = 0; i < n; i++) {
    if (a[i][i] == 0) {
      for (int j = i + 1; j < n; j++) {
        if (a[j][i] != 0) {
          swap(a[i], a[j]);
          break;
        }
      }
    }
    long long inv = modPow(a[i][i], mod - 2);
    for (int j = 0; j < n; j++) {
      if (i == j) continue;
      long long prd = (a[j][i] * inv) % mod;
      for (int k = 0; k < m; k++) {
        a[j][k] -= (prd * a[i][k]) % mod;
        if (a[j][k] < 0) a[j][k] += mod;
      }
    }
    for (int j = 0; j < m; j++) {
      (a[i][j] *= inv) %= mod;
    }
  }
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  cout << setprecision(32);
  long long val;
  vector<vector<long long> > a(11, vector<long long>(12));
  for (int i = 0; i < 11; i++) {
    long long st = 1, prd = (1 << i);
    for (int j = 0; j < 11; j++) {
      a[i][j] = st;
      (st *= prd) %= mod;
    }
    cout << "? " << prd << endl;
    cin >> val;
    a[i][11] = val;
  }
  GaussMod(a);
  vector<long long> coef(11);
  for (int i = 0; i < 11; i++) {
    coef[i] = a[i][11];
  }
  for (int i = 0; i < mod; i++) {
    long long val = 0, prd = i, st = 1;
    for (int j = 0; j < 11; j++) {
      val += coef[j] * st % mod;
      (st *= prd) %= mod;
      if (val >= mod) val -= mod;
    }
    if (val == 0) {
      cout << "! " << i << endl;
      return 0;
    }
  }
  cout << "! -1" << endl;
  return 0;
}
