import sys
n=int(input())
lose=[[] for i in range(n)]
v=[i for i in range(n)]
while len(v)>1:
  w=[]
  for i in range(0, len(v), 2):
    if i+1==len(v):
      w.append(v[i])
    else:
      print("? %d %d" % (v[i]+1, v[i+1]+1))
      sys.stdout.flush()
      res=int(input())
      res-=1
      w.append(res)
      if res==v[i]:
        lose[res].append(v[i+1])
      else:
        lose[res].append(v[i])
  v=w
a=v[0]
ans=lose[a][0]
for i in range(1, len(lose[a])):
  print("? %d %d" % (lose[a][i]+1, ans+1))
  sys.stdout.flush()
  res=int(input())
  res-=1
  ans=res
print("! %d" % (ans+1))
sys.stdout.flush()