#include <bits/stdc++.h>
using namespace std;
const int N = 200 + 10;
const int MOD = 1000003;
long long inv[MOD];
long long a[N][N], x[N];
int equ, var;
int Gauss() {
  for (int k = 0, col = 0; k < equ && col < var; k++, col++) {
    int max_r = k;
    for (int i = k + 1; i < equ; i++)
      if (abs(a[i][col]) > abs(a[max_r][col])) max_r = i;
    if (a[max_r][col] == 0) return 0;
    if (k != max_r) {
      for (int j = col; j < var; j++) swap(a[k][j], a[max_r][j]);
      swap(x[k], x[max_r]);
    }
    (x[k] *= inv[a[k][col]]) %= MOD;
    for (int j = col + 1; j < var; j++) (a[k][j] *= inv[a[k][col]]) %= MOD;
    a[k][col] = 1;
    for (int i = 0; i < equ; i++)
      if (i != k) {
        x[i] -= x[k] * a[i][k];
        x[i] = (x[i] % MOD + MOD) % MOD;
        for (int j = col + 1; j < var; j++)
          a[i][j] = ((a[i][j] - a[k][j] * a[i][col]) % MOD + MOD) % MOD;
        a[i][col] = 0;
      }
  }
  return 1;
}
long long y[202];
long long get(long long v) {
  long long tmp = v, sum = 0;
  v = 1;
  for (int j = 0; j < var; j++) {
    sum = (sum + y[j] * v) % MOD;
    v = v * tmp % MOD;
  }
  return sum;
}
int main() {
  inv[1] = 1;
  for (int i = 2; i < MOD; i++) {
    inv[i] = (MOD - (MOD / i)) * inv[MOD % i] % MOD;
  }
  equ = 50, var = 11;
  for (int i = 0; i < equ; i++) {
    long long v = 1, tmp = i;
    for (int j = 0; j < var; j++) {
      a[i][j] = v;
      v = v * tmp % MOD;
    }
    printf("? %d\n", i);
    fflush(stdout);
    scanf("%lld", &x[i]);
  }
  Gauss();
  long long ret = -1;
  for (int i = 0; i < MOD; i++) {
    long long v = 1, tmp = i, sum = 0;
    for (int j = 0; j < var; j++) {
      sum = (sum + x[j] * v) % MOD;
      v = v * tmp % MOD;
    }
    if (sum == 0) {
      printf("! %d\n", i);
      fflush(stdout);
      return 0;
    }
  }
  printf("! %lld\n", ret);
  fflush(stdout);
  return 0;
}
