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 mid = (r + l) / 2
        println("? $mid")
        val s = readLine()!!.toInt()
        val lenL = mid - l + 1
        val lenR = r - mid
        val nextL = s - L
        val nextR = R - s
        if((nextL == 0 && nextR == lenR) || (nextL == lenL && nextR == 0)){
            println("! $mid ${mid + 1}")
            break
        }
        else if(nextL == 0 || nextL == lenL){
            l = mid + 1
            L = s
        }
        else{
            r = mid
            R = s
        }
    }
}