import sys
from tkinter.messagebox import QUESTION
def Question(K):
    print(f'? {K}')
    sys.stdout.flush()
    return int(input())

def Answer(L, R):
    print(f'! {L} {R}')
    sys.stdout.flush()
    exit()

N = int(input())
M = N // 2 + 1
S = M // 2
if Question(M) == S:
    Answer(1, M)
if Question(N - M) == N // 2 - S:
    Answer(N - M + 1, N)
A = Question(1)
B = Question(2)
C = Question(N-1)
D = Question(N)
if A != B:
    Answer(3, N)
if C != D:
    Answer(1, N - 2)
if A != D:
    Answer(2, N - 1)