from math import sqrt

if __name__ == '__main__':

   pi = 0.0
   r = 1000
   r2 = r * r
   for x in range(0, r):
      h = x + 0.5
      x2 = h * h
      y = sqrt(r2 - x2)
      print(f'{x:2d}', f'{y:5.1f}')
      pi += y

   print(4 * pi / r2)