#include <iostream>
#include <cstdlib>
#include <ctime>

using namespace std;

const unsigned N = 1000000000;

int main()
{
    srand(time(nullptr));
    double x,y;
    unsigned n = 0;
    for(unsigned i = 0; i < N; ++i)
    {
        x = 1.0 * (rand() - 1) / (RAND_MAX - 1);
        y = 1.0 * (rand() - 1) / (RAND_MAX - 1);
        if(x * x + y * y <= 1)
            ++n;
    }
    cout << "Liczba pi wynosi w przyblizeniu " << 4.0 * n / N << endl;
    return 0;
}