#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;

#include<map>
map<pair<ll,ll>,ll> memo;
ll ask(ll x,ll y){
    if(memo.find({x,y})!=memo.end()) return memo[{x,y}];
    cout<<x<<" "<<y<<endl;
    ll d;
    cin>>d;
    if(d==0){
        exit(0);
    }
    return memo[{x,y}] = d;
}
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll left = 0;
    ll right = 100000;
    while(right-left>2){
        ll m1 = (left+left+right) / 3;
        ll m2 = (right+right+left) / 3;
        ll d1 = ask(m1,0);
        ll d2 = ask(m2,0);
        if(d1<=d2) right = m2;
        else left = m1;
    }
    ll use;
    ll mn = 1e9;
    for(ll x = left;x<=right;x++){
        ll d = ask(x,0);
        if(d<mn){
            mn = d;
            use = x;
        }
    }
    ll x = mn;

    left = 0;
    right = 100000;
    while(right-left>2){
        ll m1 = (left+left+right) / 3;
        ll m2 = (right+right+left) / 3;
        ll d1 = ask(x,m1);
        ll d2 = ask(x,m2);
        if(d1<=d2) right = m2;
        else left = m1;
    }
    for(ll x = left;x<=right;x++){
        ll d = ask(x,0);
    }
}