#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  for (int i = 29; i >= 0; --i) {
    cout << (1 << i) << endl;
    int r;
    cin >> r;
    if (r == 1) break;
    assert(r == 0);
  }
  return 0;
}