#include 
using namespace std;
ifstream cin("bomber.in");
ofstream cout("bomber.out");
int n , I;
struct bomba{
    int x, y, p;
    bool  explodat = false;
    void citire()
    {
        cin>>x>>y>>p;
    }
}v[10001];
int distP(int a, int b)
{
    int x = v[a].x - v[b].x;
    int y = v[a].y - v[b].y;
    return (x*x + y*y);
}
void explode(int poz)
{
    v[poz].explodat = true;
    for(int i = 1;i<=n;i++)
    {
        if(!v[i].explodat)
        {
            if(distP(poz,i) <= v[poz].p*v[poz].p)
                explode(i);
        }
    }
}
int main()
{
    cin>>n>>I;
    for(int i = 1;i<=n;i++)
        v[i].citire();
    explode(I);
    int cnt = 0;
    for(int i = 1;i<=n;i++)
        if(!v[i].explodat)
            cnt++;
    cout << cnt;
    return 0;
}