#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("cal.in");
ofstream fout ("cal.out");
int mod (int n)
{
    if (n>=0)
        return n;
    else
        return -n;
}
int main()
{
    int Sx, Sy, S, n, x, y, contor;
    fin>>Sx>>Sy>>S>>n;
    contor=0;
    for (int i=1;i<=n;i++)
    {
        fin>>x>>y;
        if (mod(Sx-x)+mod(Sy-y)==S)
            contor++;
    }
    fout<<contor;
    return 0;
}