p1=[-8,-10,0]
p2=[5,5,10]
p3=[2,-7,3]
p4=[9,-8,-3]

v1=[0,0,0]
v2=[0,0,0]
v3=[0,0,0]
v4=[0,0,0]

def update(a,b,temp):
  if a[0]>b[0]:
    temp[0]-=1
  elif a[0]<b[0]:
    temp[0]+=1

  if a[1]>b[1]:
    temp[1]-=1
  elif a[1]<b[1]:
    temp[1]+=1

  if a[2]>b[2]:
    temp[2]-=1
  elif a[2]<b[2]:
    temp[2]+=1

  return temp

stop=False

s=0

def step():
  global v1,v2,v3,v4,p1,p2,p3,p4,history,s,stop
  for i in [p1,p2,p3,p4]:
    for j in [p1,p2,p3,p4]:
      if i!=j:
        if i==p1:
          v1=update(i,j,v1)
        elif i==p2:
          v2=update(i,j,v2)
        elif i==p3:
          v3=update(i,j,v3)
        else:
          v4=update(i,j,v4)

  p1=[x + y for x, y in zip(p1, v1)]
  p2=[x + y for x, y in zip(p2, v2)]
  p3=[x + y for x, y in zip(p3, v3)]
  p4=[x + y for x, y in zip(p4, v4)]

  s+=1

  if v1==[0,0,0] and v2==[0,0,0] and v3==[0,0,0] and v4==[0,0,0]:
    print(s*2)
    stop=True

while not stop:
  step()