import sys

def ask(a):
    print(a)
    sys.stdout.flush()
    return int(input())

def main():
    # max distance, size of p
    m, n = [int(i) for i in input().split()]

    answers = []
    for i in range(n):
        a = ask(m)
        if a == 0:
            return
        answers.append(a)

    asked = n
    ppos = 0
    lower, upper = 1, m-1
    while asked < 60:
        curr = lower + (upper-lower)//2
        a = ask(curr)
        asked += 1
        if a*answers[ppos%n] == 1:
            upper = curr -1
        elif a*answers[ppos%n] == -1:
            lower = curr +1
        else:
            return
        ppos += 1

    
main()