// No.513 宝探し２
// https://yukicoder.me/problems/no/513
//

#include <iostream>
using namespace std;

int check_distance(int x, int y);


int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    
    int dist;
    dist = check_distance(0, 0);
    int lx = 0;
    int rx = dist;
    
    bool lx_update = true;
    bool rx_update = true;
    int ldist = 0;
    int rdist = 0;
    
    while (dist != 0) {
        if (lx_update) {
            ldist = check_distance(lx, dist - lx);
            lx_update = false;
            if (ldist == 0)
                break;
        }
        if (rx_update) {
            rdist = check_distance(rx, dist - rx);
            rx_update = false;
            if (rdist == 0)
                break;
        }
        if (ldist == rdist) {
            lx = (lx + rx) / 2;
            lx_update = true;
        } else if (ldist < rdist) {
            rx = (lx + rx) / 2;
            rx_update = true;
        } else {
            lx = (lx + rx) / 2;
            lx_update = true;
        }
    }
}


int check_distance(int x, int y) {
    cout << x << " " << y << endl << flush; 
    int res;
    cin >> res;
    return res;
}