#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
    while(true){
    float x,y,r;
    int c,res=0;
    cin>>x>>y>>r;
    if(r<0)
        break;
    cin>>c;
    for (int i = 0; i < c; i++)
    {

        float a,b;
        cin>>a>>b;
        if((a-x)*(a-x)+(b-y)*(b-y)<=r*r)
            res++;
    }
    cout<<res<<endl;
    }
    return 0;
}

Because we have no circle in the problem. You have counted number of points in the radious range of the given circle.

We have a semi-circle that turns around its center.

becuase your code is wrong