#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;

int main()
{
    double a, b;
    long T = 0;
    long R;
    long ilosc;

    srand(time(NULL));
    cout << "Na podstawie ilu punktów znalesc wartosc liczby pi? ";
    cin>> ilosc;
    for(R=0; R<ilosc; R++)
    {
        a = (double)rand()/(RAND_MAX);
        b = (double)rand()/(RAND_MAX);

        if (a*a+b*b<=1) T++;

    }

        cout << "liczba pi ma wartosc : " << (double) (4*T)/R;

        cin.ignore();
        getchar();
        return 0;
    }