#include <stdlib.h>
#include <iostream.h>

void main(void) {
  double t=0;
  double i=0;
  long w,z;
  double x,y;
  double j = (double)RAND_MAX*RAND_MAX;
  while (true) {
    w = rand(); z = rand(); x=w; y=z;
    if (x*x+y*y<j) i++;
    t++;
    cout << i/t*4.0 << "\n";
  }
}