import sys
readline = sys.stdin.readline

# DEBUG = True
DEBUG = False

N,K = map(int,readline().split())

class Interactive:
    def __init__(self):
        self.ques_cnt = 0
        self.create_data()
        
    def create_data(self):
        pass
        
    def resp_ques(self, *args):
        import random
        self.ques_cnt += 1
        if self.ques_cnt > 5:
            return random.randint(N,N+K)
        x = args[0]
        if x >= N:
            raise ValueError('You Lose')
        return str(x + random.randint(1,K)) + '\n'
            
    def resp_ans(self, *args):
        pass
            
if DEBUG:
    interactive = Interactive()
    
def question(*args, offset=None):
    if offset is None:
        print(*args, flush=True)
    else:
        print(offset, *args, flush=True)
    if DEBUG:
        resp = interactive.resp_ques(*args)
        print(resp, end='')
        return resp
    else:
        return readline()
    
def answer(*args, offset=None):
    if offset is None:
        print(*args, flush=True)
    else:
        print(offset, *args, flush=True)
    if DEBUG:
        interactive.resp_ans(*args)
    else:
        exit()

x = (N-1) % (K+1)
for _ in range(10):
    resp = int(question(x))
    if resp >= N:
        exit()
    x = x + K + 1