#include <bits/stdc++.h>   using namespace std;   int main() {     int i = 0, j = 0, cs = 0, in;     int n;     cin >> n;     vector<int> v;     int sum = 0, s = 0;     for (int i = 1; i < n; i++) {       cout <<  ?   << i <<     << n <<   n ;       int x;       cin >> x;       if (i > 1) {         v.push_back(sum - x - s);         s += v.back();       } else         sum = x;     }     cout <<  ?   << 1 <<     << n - 1 <<   n ;     int x;     cin >> x;     cout <<  !  ;     for (int i = 0; i < v.size(); i++) cout << v[i] <<    ;     cout << x - s <<     << sum - x <<   n ;     return 0;   }   