#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int x = 1000000000, flg = 0;
    while(flg == 0) {
        cout << x / 2 + (x % 2) << endl;
        cin >> flg;
        x = x / 2 + (x % 2);
    }
}