from heapq import heappop, heappush, heapify
from bisect import bisect
from collections import deque, defaultdict
from math import floor, ceil, isqrt, comb
from sys import stdin, setrecursionlimit
intin = lambda: int(stdin.readline())
strin = lambda: stdin.readline().rstrip()
listin = lambda: list(map(int, stdin.readline().split()))
tuplein = lambda m: [tuple(map(lambda x: int(x) if x.isdigit() or (len(x) > 1 and x[0] == "-" and x[1:].isdigit()) else x, stdin.readline().split())) for _ in range(m)]
gridin = lambda m: [list(map(int, stdin.readline().split())) for _ in range(m)]
strgridin = lambda h: [stdin.readline().rstrip() for _ in range(h)]
mapin = lambda: map(int, stdin.readline().split())
tmp = 1 << 30
while True:
    print(tmp, flush=True)
    r = intin()
    if r == 1:
        exit()
    elif r == -1:
        exit()
    tmp >>= 1