#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
template <class T>
using MaxHeap = std::priority_queue<T>;
template <class T>
using MinHeap = std::priority_queue<T, vector<T>, greater<T>>;
#define rep2(i, n) for (ll i = 0; i < (n); i++)
#define rep3(i, l, r) for (ll i = (l); i < (r); i++)
#define rrep2(i, n) for (ll i = n; i-- > 0;)
#define rrep3(i, r, l) for (ll i = (r); i-- > (l);)
#define overload(a, b, c, d, ...) d
#define rep(...) overload(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rrep(...) overload(__VA_ARGS__, rrep3, rrep2)(__VA_ARGS__)
#define all(x) begin(x), end(x)
bool chmin(auto& lhs, auto rhs) {
    return lhs > rhs ? lhs = rhs, 1 : 0;
}
bool chmax(auto& lhs, auto rhs) {
    return lhs < rhs ? lhs = rhs, 1 : 0;
}
struct IOIO {
    IOIO() {
        std::cin.tie(0)->sync_with_stdio(0);
    }
} ioio;

#ifdef DEBUG

struct Judge {
    int X;
    Judge() {
        mt19937 mt(random_device{}());
        X = mt() % (1000 - (-1000) + 1) - 1000;
        cerr << "X = " << X << endl;
    }
    int ask(int x) {
        cerr << "ask " << x << endl;
        return abs(x - X);
    }
    void answer(int x) {
        assert(x == X);
        cerr << "AC!" << endl;
    }
};

#else

struct Judge {
    Judge() {}
    int ask(int x) {
        cout << x << '\n';
        cout.flush();
        int res;
        cin >> res;
        return res;
    }
    void answer(int x) {
        cout << x << '\n';
        cout.flush();
    }
};

#endif

void solve() {
#ifdef DEBUG
    Judge judge;
#else
    Judge judge;
#endif
    int delta = judge.ask(0);
    int res = judge.ask(delta);
    int ans = (res == 0 ? delta : -delta);
    judge.answer(ans);
}

int main() {
    int t = 1;
    //  cin >> t;
    while (t--) solve();
}