from strutils import parseInt
from sequtils import mapIt

let N = stdin.readLine.parseInt

var participants = (1..N).mapIt(it)

proc ask(x, y: int): int =
  echo "? ", x, " ", y
  result = stdin.readLine.parseInt

var two = @[participants[0], participants[1]]

proc swapTow() =
  if ask(two[0], two[1]) == two[1]:
    swap(two[0], two[1])

swapTow()

for i in 2..<N:
  if ask(two[1], participants[i]) == participants[i]:
    swap(two[1], participants[i])
    swapTow()

echo "! ", two[1]