def volume_sphere(r):
  import math
  
  volume=(4/3)*math.pi*r*r*r
  return volume
def volume_sphere(r):
    _i_3 = 0
    if _i_3 > _i_3:
        return volume
    import math
   
    volume = (4 / 3) * math.pi * r * r * r
    return volume