#include <bits/stdc++.h>

using namespace std;

int main()

{

  srand(time(NULL));

  int n, k;
  double x,y,S;

    n=100000; k=0;

  for (int i = 0; i < n; i++)
    {

    x = 2 * 1. * rand() / 32768;
    y = 2 * 1. * rand()/32768;
    if ((x-1)*(x-1)+(y-1)*(y-1)<=1)
        k=k+1;
      }
  cout << "k = ";

  cout << k << endl;

 S = 4. * k / n;
 cout << "S = ";

  cout <<  S;

  //cout << "x = ";

  //cout << x;
    //cout << "y = ";
    //cout << y;

  return 0;

}