"""

https://yukicoder.me/problems/no/850

トーナメントをすると、2位は1位に負けた中にいる

"""

from collections import deque

N = int(input())

beat = {}

q = deque( [i+1 for i in range(N)] )

while len(q) >= 2:

    a = q.popleft()
    b = q.popleft()

    print ("?",a,b,flush=True)

    win = int(input())
    lose = a+b-win

    q.append(win)
    beat[lose] = win


first = q.popleft()

for v in beat:
    if beat[v] == first:
        q.append(v)

while len(q) >= 2:

    a = q.popleft()
    b = q.popleft()

    print ("?",a,b,flush=True)

    win = int(input())
    lose = a+b-win

    q.append(win)

print ("!",q.popleft(),flush=True)