#include <bits/stdc++.h>
using namespace std;
const long long N = 50, INF = 0, MOD = 0;
long long n, m, a[N], tmp;
vector<long long> v;
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cin >> m >> n;
  for (long long i = 0; i < n; i++) {
    cout << 1 << endl;
    fflush(stdout);
    cin >> tmp;
    if (tmp == 0 || tmp == -2) return 0;
    if (tmp == -1) a[i] = 0;
    if (tmp == 1) a[i] = 1;
  }
  long long l = 0, r = m + 1, cnt = 0;
  while (r - l > 2 && cnt + n < 60) {
    long long mid = (l + r) / 2;
    cout << mid << endl;
    fflush(stdout);
    cin >> tmp;
    if (tmp == 0 || tmp == -2) return 0;
    if (a[cnt] == 0) tmp *= -1;
    if (tmp == -1) r = mid;
    if (tmp == 1) l = mid;
    v.push_back(tmp);
    cnt = (cnt + 1) % n;
  }
  cout << r - 1 << endl;
  fflush(stdout);
  cin >> tmp;
  return 0;
}
