/* -*- coding: utf-8 -*-
 *
 * 850.cc:  No.850 企業コンテスト2位 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 300;

/* typedef */

/* global variables */

int as[MAX_N], bs[MAX_N];
int ms[MAX_N][MAX_N], mns[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  for (int i = 0; i < n; i++) as[i] = i;

  for (int m = n; m > 1;) {
    int k = 0;
    for (int i = 0; i + 1 < m; i += 2) {
      int a0 = as[i], a1 = as[i + 1];
      ms[a0][mns[a0]++] = a1;
      ms[a1][mns[a1]++] = a0;
      printf("? %d %d\n", a0 + 1, a1 + 1); fflush(stdout);
      int x;
      scanf("%d", &x);
      x--;
      bs[k++] = x;
    }
    if (m & 1) bs[k++] = as[m - 1];

    memcpy(as, bs, sizeof(bs));
    m = k;
  }

  int ch = as[0];
  //for (int i = 0; i < mc; i++) printf("%d ", mas[i]); putchar('\n');
  int sec = ms[ch][0];
  for (int i = 1; i < mns[ch]; i++) {
    printf("? %d %d\n", sec + 1, ms[ch][i] + 1); fflush(stdout);
    int x;
    scanf("%d", &x);
    x--;
    sec = x;
  }

  printf("! %d\n", sec + 1); fflush(stdout);
  return 0;
}