#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

int x[10000];
int y[10000];

const int a = 200;
const int b = 200;
const int pk = 200 * 200 * 3.141592;
const double p = 400 * 400;
const double PI = 3.1415926535;

int main()
{
    fstream file;
    file.open("punkty.txt", ios::in);
    for(int i=0; i<10000; i++)
        file >> x[i] >> y[i];


    for(int i=0; i<10000; i++)
        if(pow(x[i] - 200, 2) + pow(y[i] - 200, 2) == 40000)
            cout << x[i] << " " << y[i] << endl;

    cout << endl << endl << endl;

    int counter = 0;
    double pi = 0;
    for(int i=0; i<10000; i++)
    {
        if(pow(x[i]-a,2) + pow(y[i]-b, 2) < a*a || pow(x[i]-a,2) + pow(y[i]-b, 2) == a*a)
            counter++;

        if( counter > 0 )
                pi = (counter * p) / ((i+1) * a * a);
            if(i == 999 || i == 4999)
            cout << pi << endl;
    }
    cout << pi << endl;

    pi = 0;
    counter = 0;
    double mistake;
    for(int i=0; i<1700; i++)
    {
        if(pow(x[i]-a,2) + pow(y[i]-b, 2) < a*a)
        {
            counter++;
        }

        if( counter > 0 )
            pi = (counter * p) / ((i+1) * a * a);

        mistake = abs(PI - pi);
        //cout << mistake << endl;
    }

    return 0;
}