#include <bits/stdc++.h>

using i32 = int_fast32_t;
using i64 = int_fast64_t;
using u32 = uint_fast32_t;
using u64 = uint_fast64_t;
using f64 = double;
using f80 = long double;

#define FOR(v, a, b) for(i64 v = (a); v < (b); ++v)
#define FORE(v, a, b) for(i64 v = (a); v <= (b); ++v)
#define REP(v, n) FOR(v, 0, n)
#define REPE(v, n) FORE(v, 0, n)
#define REV(v, a, b) for(i64 v = (a); v >= (b); --v)
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define ITR(it, c) for(auto it = (c).begin(); it != (c).end(); ++it)
#define RITR(it, c) for(auto it = (c).rbegin(); it != (c).rend(); ++it)
#define EXIST(c,x) ((c).find(x) != (c).end())
#define fst first
#define snd second
#define UNIQ(v) (v).erase(unique(ALL(v)), (v).end())
#define bit(i) (1LL<<(i))

#ifdef DEBUG
#include <Mylib/Debug/debug.cpp>
#else
#define dump(...) ((void)0)
#endif

using namespace std;

template <typename I> void join(ostream &ost, I s, I t, string d=" "){for(auto i=s; i!=t; ++i){if(i!=s)ost<<d; ost<<*i;}ost<<endl;}
template <typename T> istream& operator>>(istream &is, vector<T> &v){for(auto &a : v) is >> a; return is;}
template <typename T> void puts_all(const T &value){std::cout << value << "\n";}
template <typename T, typename ...Args> void puts_all(const T &value, const Args&... args){std::cout << value << " ";puts_all(args...);}

template <typename T, typename U> bool chmin(T &a, const U &b){return (a>b ? a=b, true : false);}
template <typename T, typename U> bool chmax(T &a, const U &b){return (a<b ? a=b, true : false);}
template <typename T, size_t N, typename U> void fill_array(T (&a)[N], const U &v){fill((U*)a, (U*)(a+N), v);}
template <typename T> auto make_vector(int n, int m, const T &value){return vector<vector<T>>(n, vector<T>(m, value));}


struct Init{
  Init(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(12);
    cerr << fixed << setprecision(12);
  }
}init;


#ifdef DEBUG
#include <boost/asio.hpp>
namespace asio = boost::asio;
namespace ip = asio::ip;
#endif

class Client{
#ifdef DEBUG
  ip::tcp::iostream stream;
#endif

public:
  Client(int port){
#ifdef DEBUG
    stream = ip::tcp::iostream("localhost", std::to_string(port));
#endif
  }

  template <typename T>
  void write(const T &value){
#ifdef DEBUG
    stream << value << "\n";
    stream.flush();
#endif

    std::cout << value << std::endl;
  }

  template <typename T, typename ...Args>
  void write(const T &value, const Args&... args){
#ifdef DEBUG
    stream << value << " ";
    stream.flush();
#endif

    std::cout << value << " ";

    write(args...);
  }
  
  
  template <typename T>
  T read(){
      T ret;
#ifdef DEBUG
      stream >> ret;
      dump(ret);
#else
      std::cin >> ret;
#endif
      return ret;
  }
};




int main(){
  Client client(50000);


  client.write(0, 0);
  int a = client.read<int>();

  client.write(0, 100000);
  int b = client.read<int>();


  int Y = 50000 + (a - b) / 2;

  client.write(0, Y);
  int X = client.read<int>();

  client.write(X, Y);
  client.read<int>();

  return 0;
}