import sys
import math
input = sys.stdin.readline
def read_values(): return map(int, input().split())
def read_index(): return map(lambda x: int(x) - 1, input().split())
def read_list(): return list(read_values())
from fractions import Fraction

def main():
  a=1
  mx=10**100
  while a<mx:
    a*=2
  a//=2
  ans=0
  while a>0:
    print("?",1,a,flush=True)
    c=input()
    if c[0]==">" or c[0]=='=':
      ans+=a
    a//=2
  print("!", ans,flush=True)
    
    
      
if __name__ == "__main__":
  main()