import sys
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
if Question(M * 2) == M:
    Answer(1, M * 1)
if Question(2) == 1:
    Answer(3, N)
Answer(2, N - 1)