import kotlin.math.*
import java.lang.StringBuilder
import java.util.*

fun main(args:Array<String>) {
    solve()
}

fun solve(){
    val n = readLine()!!.toInt()
    var l = 1
    var r = n
    var R = n / 2
    var L = 0
    while(r - l > 0){
        val div1 = (r + l * 3) / 4
        val div2 = (r * 3 + l) / 4
        println("? $div1")
        val s1 = readLine()!!.toInt()
        println("? $div2")
        val s2 = readLine()!!.toInt()
        val lenR = r - div1
        val lenL = div2 - l + 1
        val frontR = R - s1
        val frontL = s2 - L
        val backR = lenR - frontR
        val backL = lenL - frontL
        val maxR = max(frontR, backR)
        val maxL = max(frontL, backL)
        if(frontR == backR){
            println("! ${div1 + 1} $r")
            break
        }
        else if(frontL == backL){
            println("! $l $div2")
            break
        }
        else if(maxR >= maxL){
            r = div2
            R = s2
        }
        else{
            l = div1 + 1
            L = s1
        }
    }
}