#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e6 + 3;
const int MAX = 15, INF = 1e9;
int n;
long long p, ans[MAX], a[MAX][MAX];
long long fpow(long long b, int p) {
  long long r = 1;
  while (p > 0) {
    if (p & 1) r = (1ll * r * b) % MOD;
    p >>= 1;
    b = (1ll * b * b) % MOD;
  }
  return r;
}
int gauss(int n, int m, long long a[MAX][MAX], long long ans[MAX]) {
  int pos[MAX];
  memset(pos, 0, sizeof(pos));
  bool flag = 0;
  int row = 1, col = 1;
  for (; row <= n && col <= m; col++) {
    int piv = row;
    for (int i = row; i <= n; i++)
      if (abs(a[i][col]) > abs(a[piv][col])) piv = i;
    if (abs(a[piv][col]) == 0) {
      flag = 1;
      continue;
    }
    for (int i = 1; i <= m + 1; i++) swap(a[row][i], a[piv][i]);
    pos[col] = row;
    long long d = a[row][col];
    long long invd = fpow(d, MOD - 2);
    for (int i = 1; i <= m + 1; i++) a[row][i] = 1ll * a[row][i] * invd % MOD;
    for (int i = 1; i <= n; i++) {
      if (i == row) continue;
      d = a[i][col];
      for (int j = 1; j <= m + 1; j++) {
        a[i][j] -= (1ll * a[row][j] * d) % MOD;
        if (a[i][j] < 0) a[i][j] = (a[i][j] + MOD) % MOD;
      }
    }
    row++;
  }
  for (int i = 1; i <= m; i++) {
    if (pos[i] == 0)
      ans[i] = 0;
    else
      ans[i] = a[pos[i]][m + 1];
  }
  for (int i = 1; i <= n; i++) {
    long long sum = 0;
    for (int j = 1; j <= m; j++) {
      long long val = (1ll * ans[j] * a[i][j]) % MOD;
      sum = (sum + val) % MOD;
    }
    if (abs(sum - a[i][m + 1]) > 0) return 0;
  }
  if (flag) return INF;
  return 1;
}
long long f[MAX];
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  for (int i = 0; i <= 10; i++) {
    cout << "? " << i << endl;
    cin >> f[i + 1];
  }
  for (int i = 0; i <= 10; i++) {
    long long tmp = 1ll;
    a[i + 1][1] = tmp;
    for (int j = 1; j < 11; j++)
      a[i + 1][j + 1] = 1ll * tmp * i % MOD, tmp = 1ll * tmp * i % MOD;
    a[i + 1][12] = f[i + 1];
  }
  int tmpp = gauss(11, 11, a, ans);
  for (int i = 0; i <= MOD - 1; i++) {
    long long val = ans[1];
    long long tmp = 1;
    for (int j = 2; j <= 11; j++) {
      tmp = tmp * i % MOD;
      long long val2 = (long long)ans[j] * tmp % MOD;
      val = (val + val2) % MOD;
    }
    if (val == 0) return !(cout << "! " << i << endl);
  }
  cout << "! " << -1 << endl;
  return 0;
}
