import sys

n = int(input())
battle = [[-1]*n for i in range(n)]

lose = [0]*n
b = len(bin(n))-3

dif = n%(1<<b)

def update(x,y):
    win = int(input())-1
    if win == x:
        battle[x][y] = 1
        battle[y][x] = 0
        lose[y] = 1
    else:
        battle[y][x] = 1
        battle[x][y] = 0
        lose[x] = 1
for i in range(dif):
    x,y = 2*i,2*i+1
    print("?",x+1,y+1)
    sys.stdout.flush()
    update(x,y)

    

for i in range(b-1,-1,-1):

    left = [i for i in range(n) if lose[i] == 0]

    l = 1<<i
    for j in range(l):
        x,y = left[2*j],left[2*j+1]
        print("?",x+1,y+1)
        sys.stdout.flush()
        update(x,y)

left = [i for i in range(n) if lose[i] == 0]
win = left[0]

cand = []

for i in range(n):
    if battle[win][i] == 1:
        cand.append(i)

second = cand[0]
for i in cand[1:]:
    print("?",second+1,i+1)
    sys.stdout.flush()
    win = int(input())-1
    if second != win:
        second = i
print("!",second+1)
sys.stdout.flush()