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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    auto ask = [&](int x, int y){
        int res;
        cout << x << ' ' << y << endl;
        cin >> res;
        if(res == 0) exit(0);
        return res;
    };
    pair<int, int> mn = {1 << 30, -1};
    int l = 0, r = 100000, c1, c2;
    while(l + 2 < r){
        c1 = (2 * l + r) / 3;
        c2 = (l + 2 * r) / 3;
        int v1 = ask(c1, 0), v2 = ask(c2, 0);
        if(v1 > v2) l = c1;
        else r = c2;
    }
    for(int i = l; i <= r; i++){
        mn = min(mn, make_pair(ask(i, 0), i));
    }
    ask(mn.second, mn.first);
}