#include <bits/stdc++.h>
using namespace std;
long long power(long long a, long long b, long long m = 1000003) {
  long long res = 1;
  while (b > 0) {
    if (b & 1) res = (res * a) % m;
    a = (a * a) % m;
    b >>= 1;
  }
  return res;
}
vector<long long> a;
long long inverse(long long x) { return power(x, 1000003 - 2); }
long long forwardElim(long long mat[11][11 + 1]);
vector<long long> backSub(long long mat[11][11 + 1]);
vector<long long> gaussianElimination(long long mat[11][11 + 1]) {
  forwardElim(mat);
  return backSub(mat);
}
void swap_row(long long mat[11][11 + 1], long long i, long long j) {
  for (int k = 0; k <= 11; k++) swap(mat[i][k], mat[j][k]);
}
long long forwardElim(long long mat[11][11 + 1]) {
  for (int k = 0; k < 11; k++) {
    long long i_max = k;
    long long v_max = mat[i_max][k];
    for (int i = k + 1; i < 11; i++)
      if (abs(mat[i][k]) > v_max) v_max = mat[i][k], i_max = i;
    if (!mat[k][i_max]) return k;
    if (i_max != k) swap_row(mat, k, i_max);
    for (int i = k + 1; i < 11; i++) {
      long long f = mat[i][k] * inverse(mat[k][k]);
      f %= 1000003;
      for (int j = k + 1; j <= 11; j++) {
        mat[i][j] -= mat[k][j] * f;
        mat[i][j] %= 1000003;
        if (mat[i][j] < 0) mat[i][j] += 1000003;
      }
      mat[i][k] = 0;
    }
  }
}
vector<long long> backSub(long long mat[11][11 + 1]) {
  vector<long long> x(11);
  for (int i = 11 - 1; i >= 0; i--) {
    x[i] = mat[i][11];
    for (int j = i + 1; j < 11; j++) {
      x[i] -= mat[i][j] * x[j];
      x[i] %= 1000003;
      if (x[i] < 0) x[i] += 1000003;
    }
    x[i] = x[i] * inverse(mat[i][i]);
    x[i] %= 1000003;
  }
  return x;
}
int query(int x) {
  cout << "? " << x << endl;
  fflush(stdout);
  int res;
  cin >> res;
  return res;
}
int main() {
  long long mat[11][11 + 1];
  for (int i = 0; i < 11; i++) {
    long long res = query(i);
    long long t = 1;
    for (int j = 0; j < 11; j++) {
      mat[i][j] = t;
      t = (t * i) % 1000003;
    }
    mat[i][11] = res;
  }
  a = gaussianElimination(mat);
  for (int i = 0; i < 1000003; i++) {
    long long res = 0;
    for (int j = 11 - 1; j >= 0; j--) {
      res = i * res + a[j];
      res %= 1000003;
      if (res < 0) res += 1000003;
    }
    if (res == 0) {
      cout << "! " << i << endl;
      fflush(stdout);
      return 0;
    }
  }
  cout << "! " << -1 << endl;
  fflush(stdout);
  return 0;
}
