import os
from math import ceil
clear = lambda: os.system('cls' if os.name == 'nt' else 'clear')

n = int(input())
guess = 0
numbers = [1, n]

def pprint(n):
    print("?", n)
    # print("\n")
    # clear()

def make_a_guess():
    number = (numbers[0] + numbers[1]) / 2
    if int(number) == float(number):
        number = int(number) + 1
    else:
        number = ceil(number)
    return number





guess = make_a_guess()
pprint(guess)
while True:
    x = input()

    if x == "<":
        numbers[1] = guess - 1
    elif x == "<=":
        numbers[1] = guess
    elif x == ">":
        numbers[0] = guess - 1
    elif x == ">=":
        numbers[0] = guess

    guess = make_a_guess()

    if len(set(numbers)) == 1:
        print("!", numbers[0])
        break
    pprint(guess)