#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (ll)(n); i++)
#define all(a) (a).begin(), (a).end()
using ll = long long;
const int INF32 = 2e9;
const ll INF64 = 4e18;

int main() {
    int x = 536870912;
    for (int i = 0; i < 30; i++) {
        cout << x << endl;
        cout << flush;
        int in;
        cin >> in;
        if (in == -1)return 0;
        if (in == 1)return 0;
        if (in == 0)x = x/2;
    }
	return 0;
}