#include <iostream>
#include <iomanip>
#include <stack>
#include <queue>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
using namespace std;

signed main(){
    double in;

    int x = 0;
    int y = 0;
    cout << x << " " << y << endl;

    cin >> in;
    if(in == 0){
        return 0;
    }

    int high = 1e6;
    int low = 0;
    while(high - low > 1){
        int mid = (high + low) / 2;
        cout << mid << " " << y << endl;

        double tmp;
        cin >> tmp;

        if(tmp == 0){
            return 0;
        }
        if(in > tmp){
            in = tmp;
            low = mid;
        }else if(in < tmp){
            high = mid;
        }else{
            break;
        }
    }

    high = 1e6;
    low = 0;
    while(high - low > 1){
        int mid = (high + low) / 2;
        cout << x << " " << mid << endl;

        double tmp;
        cin >> tmp;

        if(tmp == 0){
            return 0;
        }
        if(in > tmp){
            in = tmp;
            low = mid;
        }else if(in < tmp){
            high = mid;
        }else{
            break;
        }
    }

}