# root1
# Fig. 51.4
# inputs: 2 1

EPS = 1e-10

def root(x, y):
  print(f"{x:.10f}  {y:.10f}")
  if abs(x-y)/x < EPS:
    return (x+y)/2
  else:
    return root((x+y)/2, 2*x*y/(x+y))


x,y = map(float, input("x y? ").split())
print(f"{root(x, y):.10f}")