import sequtils,strutils
var
    N = stdin.readline.parseInt
    A : array[301, int]
    B = newSeq[int](0)
    win : int
for i in 1..N:
    B.add(i)
    A[i] = i
for t in 0..1:
    var
        B2 = B
    while B2.len > 1:
        var B3 = newSeq[int](0)
        for i in countup(1, B2.high, 2):
            echo "? ",B2[i - 1], " ", B2[i]
            var an = stdin.readline.parseInt
            B3.add(an)
            if B2[i - 1] == an:
                A[B2[i]] = an
            else:
                A[B2[i - 1]] = an
        if B2.len mod 2 == 1:
            B3.add(B2[^1])
        B2 = B3
    win = B2[0]
    if t == 1:
        break
    B = @[]
    for i in 1..N:
        if A[i] == win and i != A[i]:
            B.add(i)
echo "! " , win