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

using namespace std;

const int N = 10000000;

int main()
{
    srand(static_cast<unsigned>(time(nullptr)));

    double x,y;
    int n = 0;

    for(int i = 0; i < N; ++i)
    {
        x = 1.0 * rand() / RAND_MAX;
        y = 1.0 * rand() / RAND_MAX;
        if(x*x + y*y <= 1)
            ++n;
    }

    cout << "Oszacowanie liczby PI wynosi: " << 4.0 * n / N << endl;

    return 0;
}