# include <iostream>
# include <cmath>
using namespace std;

struct Wektor2d
{
	double x,y;
}
double dlugosc(Wektor2d w)
{
	double norma;
	norma=sqrt(pow(w.x,2)+pow(w.y,2));
	return norma;
}
void inssert (Wektor2d*x,int n)
{
	for (int i=1;i<n;i++)
	{
		int j=i;
		while(j>0 && dlugosc(x[j-1])>dlugosc(x[j]))
		{
			Wektor2d t=x[j];
			x[j]=x[j-1];
			x[j-1]=t;
			j--;
		}
	}


}



int main()
{
	Wektor2d w;
	cin>>w.x>>w.y;
	double norma=dlugosc(w);
	int n;
	cin>>n;
	Wektor2d*x=new Wektor2d[n];
	for(int i=0;i<n;i++)
		cin>>x.x[i]>>x.y[i];
	inssert (x,n);


	system ("pause");
	return 0;
}