Go: package main

import (
	"bufio"
	"os"
	"math"
	"strings"
	"strconv"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

const (
	INF = 0x7FFFFFFF
	EPS = 1e-10
)

type Point struct {
	x, y float64
}
func (p *Point) plus(q *Point) *Point {
	return &Point{p.x + q.x, p.y + q.y}
}
func (p *Point) minus(q *Point) *Point {
	return &Point{p.x - q.x, p.y - q.y}
}
func (p *Point) multi(a float64) *Point {
	return &Point{p.x * a, p.y * a}
}
func (p *Point) div(a float64) *Point {
	return &Point{p.x / a, p.y / a}
}
func (p *Point) abs() float64 {
	return math.Sqrt(p.norm())
}
func (p *Point) norm() float64 {
	return p.x*p.x + p.y*p.y
}
func (p *Point) isLessThan(q *Point) bool {
	if p.x != q.x {
		return p.x < q.x && p.y < q.y
	}
	return true
}
func (p *Point) isEqual(q *Point) bool {
	return math.Abs(p.x - q.x) < EPS && math.Abs(p.y - q.y) < EPS
}

type Segment struct {
	p1, p2 *Point
}
func (s *Segment) norm() float64 {
	return (s.p2.x - s.p1.x)*(s.p2.x - s.p1.x) +
		(s.p2.y - s.p1.y)*(s.p2.y - s.p1.y)
}
func (s *Segment) abs() float64 {
	return math.Sqrt(s.norm())
}

func norm(a *Point) float64 {
	return a.x*a.x + a.y*a.y
}

func abs(a *Point) float64 {
	return math.Sqrt(norm(a))
}

func polar(a, r float64) *Point {
	return &Point{math.Cos(r)*a, math.Sin(r)*a}
}

func getDistance(a, b *Point) float64 {
	return abs(a.minus(b))
}

func dot(a, b *Point) float64 {
	return a.x*b.x + a.y*b.y
}

func cross(a, b *Point) float64 {
	return a.x*b.y - a.y*b.x
}

func getDistanceLP(s Segment, p *Point) float64 {
	return cross(s.p2.minus(s.p1), p.minus(s.p1))/ abs(s.p2.minus(s.p1))
}

func getDistanceSP(s Segment, p *Point) float64 {
	if dot(s.p2.minus(s.p1), p.minus(s.p1)) < 0 {
		return abs(p.minus(s.p1))
	}
	if dot(s.p1.minus(s.p2), p.minus(s.p2)) < 0 {
		return abs(p.minus(s.p2))
	}
	return getDistanceLP(s, p)
}

func main() {
	for scanner.Scan() {
		buf := strings.Split(scanner.Text(), " ")
		R, _ := strconv.Atoi(buf[0])
		N, _ := strconv.Atoi(buf[1])
		if R == 0 && N == 0 {
			break
		}
		p := make([]*Point, N)
		r := make([]float64, N)
		v := make([]float64, N)
		d := make([]float64, N)
		nd := make([]float64, N)
		die := make([]bool, N)
		for i := 0; i < N; i++ {
			scanner.Scan()
			buf_ := strings.Split(scanner.Text(), " ")
			_x, _ := strconv.ParseFloat(buf_[0], 64)
			_y, _ := strconv.ParseFloat(buf_[1], 64)
			_r, _ := strconv.ParseFloat(buf_[2], 64)
			_v, _ := strconv.ParseFloat(buf_[3], 64)
			tmp := &Point{_x, _y}
			p[i] = tmp
			r[i] = _r
			v[i] = _v
			nd[i] = getDistance(p[i], &Point{0, 0})
			d[i] = getDistance(p[i], &Point{0, 0})
			die[i] = false
		}
		for {
			for i := 0; i < N; i++ {
				nd[i] = math.Max(float64(R), nd[i]-v[i])
			}
			mini := float64(INF)
			id := -1
			for i := 0; i < N; i++ {
				if die[i] {
					continue
				}
				if nd[i] < EPS+float64(R) {
					continue
				}
				if nd[i] > mini {
					continue
				}
				mini = nd[i]
				id = i
			}
			if id == -1 {
				break
			}
			s := Segment{p[id], p[id]}
			s.p1 = s.p1.div(d[id])
			s.p1 = s.p1.multi(float64(R))
			s.p2 = s.p2.div(d[id])
			s.p2 = s.p2.multi(10000000.0)
			for i := 0; i < N; i++ {
				if nd[i] < EPS + float64(R) {
					continue
				}
				a := p[i]
				a = a.div(d[i])
				a = a.multi(nd[i])
				if getDistanceSP(s, a) < EPS + r[i] {
					die[i] = true
				}
			}
		}
		ans := 0
		for i := 0; i < N; i++ {
			if !die[i] {
				ans++
			}
		}
		fmt.Println(ans)
	}
}

C++: #include<iostream>
#include<cfloat>
#include<cmath>
#include<vector>
#include<algorithm>
#include<stdio.h>
using namespace std;
 
#define EPS (1e-10)
#define equals(a, b) (fabs((a) - (b)) < EPS )
#define dle(a, b) (equals(a, b) || a < b )
#define PI 3.14159265359
#define PI2 6.28318530718
#define INF 9999999.9999

class Point{
public:
  double x, y;
  Point ( double x = 0, double y = 0): x(x), y(y){}
  Point operator + ( Point p ){ return Point(x + p.x, y + p.y); }
  Point operator - ( Point p ){ return Point(x - p.x, y - p.y); }
  Point operator * ( double a ){ return Point(x*a, y*a); }
  Point operator / ( double a ){ return Point(x/a, y/a); }
  double abs() { return sqrt(norm());}
  double norm() { return x*x + y*y; }
  bool operator < ( const Point &p ) const {
    return x != p.x ? x < p.x : y < p.y;
  }
  bool operator == ( const Point &p ) const {
    return fabs(x-p.x) < EPS && fabs(y-p.y) < EPS;
  }
};

class Segment{
public:
  Point p1, p2;
  Segment ( Point p1 = Point(), Point p2 = Point() ): p1(p1), p2(p2){}
  double abs() { return sqrt(norm());}
  double norm() { return (p2.x - p1.x)*(p2.x - p1.x) + (p2.y - p1.y)*(p2.y - p1.y); }
};

typedef Segment Line;
typedef Point Vector;

double norm( Vector a ){ return a.x*a.x + a.y*a.y; }
double abs( Vector a ){ return sqrt(norm(a)); }
Point polar( double a, double r ){ return Point(cos(r)*a, sin(r)*a);}
double getDistance( Vector a, Vector b ){ return abs(a - b); }
double dot( Vector a, Vector b ){ return a.x*b.x + a.y*b.y; }
double cross( Vector a, Vector b ){ return a.x*b.y - a.y*b.x; }

double getDistanceLP(Line s,Point p){
  return abs( cross(s.p2-s.p1,p-s.p1)/abs(s.p2-s.p1) );
}

double R;
int N,ans,id;
Point p[100];
double r[100],v[100],d[100];
bool die[100];
Segment s;

int main(){
  while(1){
    cin>>R>>N;
    if(R==0&&N==0)break;
    for(int i=0;i<N;i++){
      cin>>p[i].x>>p[i].y>>r[i]>>v[i];
      d[i]=getDistance(p[i],Point(0,0));
      die[i]=false;
    }

    while(1){
      //１分進める
      for(int i=0;i<N;i++){
	if(d[i] <= R+EPS)continue;
	p[i]=p[i]/d[i];
	d[i]=max(0.0,d[i]-v[i]);
	p[i]=p[i]*d[i];
      }

      //最も近くにいる敵を探す
      double mini=INF;
      id=-1;
      for(int i=0;i<N;i++){
	if( die[i] )continue;
	if(d[i] <= R+EPS)continue;
	if(d[i] > mini)continue;
	mini=d[i];
	id=i;
      }
      if(id==-1)break;

      //レーザー発射の処理
      s = Segment( Point() , p[id] );
      for(int i=0;i<N;i++){
	if( die[i] ) continue;
	if( d[i] <= R +EPS) continue;
	if( dot(p[i],p[id]) < 0 ) continue;

	if( getDistanceLP( s , p[i] ) <= r[i] +EPS)die[i]=true;
	
	Point a = (p[i]  * max(R,d[i]-v[i])) / d[i];
	if( getDistanceLP( s, a ) <= r[i] +EPS)die[i]=true;
	
      }
      //１ターン終了
    }
    ans=0;
    for(int i=0;i<N;i++){
      if(die[i]==false)ans++;
    }
    cout<<ans<<endl;
  }
    
  
  return 0;
}

C++: #include<stdio.h>
#include<algorithm>
#include<math.h>
using namespace std;
double eps=1e-9;
double PI=acos(-1.0);
double x[110];
double y[110];
double r[110];
double th[110];
double v[110];
double d[110];
int in[110];
int main(){
	int a,b;
	while(scanf("%d%d",&a,&b),a){
		int ret=0;
		for(int i=0;i<b;i++)in[i]=0;
		int rem=b;
		for(int i=0;i<b;i++){
			scanf("%lf%lf%lf%lf",x+i,y+i,r+i,v+i);
			th[i]=atan2(y[i],x[i]);
			d[i]=sqrt(x[i]*x[i]+y[i]*y[i]);
			if(x[i]*x[i]+y[i]*y[i]<eps+a*a){
				in[i]=1;
				ret++;
				rem--;
			}
		}
		while(rem){
			double val=999999999;
			int at=-1;
			for(int i=0;i<b;i++){
				if(in[i])continue;
				d[i]-=v[i];
				if(d[i]<eps+a){
					in[i]=1;
					ret++;
					rem--;
				}else if(val>d[i]){
					val=d[i];at=i;
				}
			}
			if(!~at)break;
			for(int i=0;i<b;i++){
				if(in[i])continue;
				double dif=th[i]-th[at];
				while(dif>=PI*2)dif-=PI*2;
				while(dif<0)dif+=PI*2;
				if(PI/2<dif&&dif<PI*3/2){
					if(d[i]<r[i]+eps){
						in[i]=1;rem--;
					}
					continue;
				}
				double X=d[i]*cos(th[i]);
				double Y=d[i]*sin(th[i]);
				double d2=(y[at]*X-x[at]*Y)*(y[at]*X-x[at]*Y)/(x[at]*x[at]+y[at]*y[at]);
				if(d2<r[i]*r[i]+eps){
					in[i]=1;
					rem--;
				}
			}
		}
		printf("%d\n",ret);
	}
	
}