#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <complex>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <iomanip>
#include <assert.h>
#include <array>
#include <cstdio>
#include <cstring>
#include <random>
#include <functional>
#include <numeric>
#include <bitset>
#include <fstream>

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)

using namespace std;

#define INF (1e10)
#define EPS (1e-7)
double const PI = acos(-1);

struct Point3D {
 double x, y, z;
 Point3D(){}
 Point3D(double x, double y, double z) :
   x(x), y(y), z(z) {}

 Point3D operator + (const Point3D &p) const {
   return Point3D(x + p.x, y + p.y, z + p.z);
 }

 Point3D operator - (const Point3D &p) const {
   return Point3D(x - p.x, y - p.y, z - p.z);
 }

 Point3D operator * (double k) const {
   return Point3D(x * k, y * k, z * k);
 }

 Point3D operator / (double k) const {
   return Point3D(x / k, y / k, z / k);
 }
};

double dot(const Point3D &a, const Point3D &b)
{
 return a.x * b.x + a.y * b.y + a.z * b.z;
}

double norm(const Point3D &p)
{
 return dot(p, p);
}

double abs(const Point3D &p)
{
 return sqrt(norm(p));
}

double cross(const Point3D &a, const Point3D &b)
{
 return abs(Point3D(a.y * b.z - a.z * b.y,
         a.z * b.x - a.x * b.z,
         a.x * b.y - a.y * b.x));
}

istream &operator >> (istream &is, Point3D &p) 
{
 return is >> p.x >> p.y >> p.z;
}

ostream &operator << (ostream &os, Point3D &p)
{
   return os << "(" << p.x << ", " << p.y << ", " << p.z << ")";
}

struct LineSD {
 Point3D src, dir;
 LineSD() {}
 LineSD(Point3D src, Point3D dir) : src(src), dir(dir) {}
};

ostream &operator << (ostream &os, LineSD &l)
{
  return os << "[ src: " << l.src << ", dir: " << l.dir << " ]";
}

Point3D projection(const LineSD &l, const Point3D &p)
{
 double t = dot(p - l.src, l.dir) / norm(l.dir);
 return l.src + l.dir * t;
}

double distanceLP(const LineSD &l, const Point3D &p)
{
 return abs(p - projection(l, p));
}

struct Sphere {
 Point3D p;
 double r;
 Sphere() {}
 Sphere (Point3D p, double r) : p(p), r(r) {}
};

LineSD reflectionSL(const Sphere &s, const Point3D &crp, const LineSD &l) {
  auto& O = s.p;
  auto& P = crp;
  double theta = acos(dot(l.src - P, P - O) / abs(l.src - P) / abs(P - O));
  double phi = PI / 2 - theta;
  double K = abs(l.src - P) * sin(phi);
  Point3D e = (O - P) / abs(O - P);
  Point3D S = l.src + e * (K * 2);
  Point3D R = P + (P - S);
  return LineSD(P, R - P);
}

bool isIntersectSL(const Sphere &s, const LineSD &l)
{
  return distanceLP(l, s.p) <= s.r + EPS;
}

vector<Point3D> getIntersectSL(const Sphere &s, const LineSD &l)
{
  auto& O = s.p;
  auto T = projection(l, s.p);
  auto TO = T - O;
  auto e = l.dir / abs(l.dir);
  auto len = sqrt(s.r * s.r - norm(TO));
  return {T + e * len, T - e * len};
}


vector<Sphere> spheres;
Point3D src;
LineSD L;

pair<int, Point3D> get_next_sphere() {
  double minDist = INF;
  Point3D retp;
  int midx = -1;
  rep(i, spheres.size()) {  
    auto& sphere = spheres[i];
    if(!isIntersectSL(sphere, L)) continue;
    auto vec = getIntersectSL(sphere, L);
    assert(!vec.empty());
    if(abs(vec[0] - (L.src - L.dir)) < abs(vec[0] - (L.src + L.dir))) continue;
    double md = INF;
    Point3D p;
    for(auto && e: vec) {
      double d = abs(e - L.src);
      if(md > d) md = d, p = e;
    }
    if(md < EPS) continue;
    if(minDist > md) {
      minDist = md;
      midx = i;
      retp = p;
    }
  }
  return make_pair(midx, retp);
}

void solve() {
  L = LineSD(Point3D(0, 0, 0), src);
  while(1) {
    int sphere_idx; Point3D crp; tie(sphere_idx, crp) = get_next_sphere();
    if(sphere_idx == -1) break;
    else L = reflectionSL(spheres[sphere_idx], crp, L);
  }
  printf("%.10f %.10f %.10f\n", L.src.x, L.src.y, L.src.z);
}

int main()
{
 int N;
 while (cin >> N, N) {
   spheres.clear(); spheres.resize(N);
   cin >> src;
   for (int i = 0; i < N; i++) {
     cin >> spheres[i].p >> spheres[i].r;
   }
   solve();
 }
 return 0;
}

Measured memory_bytes: 3592