# coding: utf-8
# Your code here!

import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

n=int(input())

cand = [[i] for i in range(1,n+1)]
while len(cand) > 1:
    cand2 = []
    while len(cand) > 1:
        a = cand.pop()
        b = cand.pop()
        print("?", a[0], b[0])
        sys.stdout.flush()
        res = int(input())
        if res == a[0]:
            a.append(b[0])
            cand2.append(a)
        else:
            b.append(a[0])
            cand2.append(b)
    if cand: cand2.append(cand[0])
    cand = cand2

cand = cand[0]
cand.pop(0)

ans = cand.pop()
while cand:
    c = cand.pop()
    print("?", ans, c)
    sys.stdout.flush()
    res = int(input())
    if res == c: ans = c

print("!", ans)