'''

Joshua Nguyen

February 27,2013

Mr.Potter

Contest #3

Enloe

Intermediate

'''

for repeatprogram in range(5):

coords=[]

death=0

CList=[]

inputs=raw_input()

coords.append([int(inputs[0]),int(inputs[2])])

coords.append([int(inputs[4]),int(inputs[6])])

N=int(inputs[-1])

for x in range(N+1):

for y in range(2):

CList.append([coords[y][0]+x,coords[y][1]])

CList.append([coords[y][0]-x,coords[y][1]])

CList.append([coords[y][0],coords[y][1]+x])

CList.append([coords[y][0],coords[y][1]-x])

CList.append([coords[y][0]+x,coords[y][1]+x])

CList.append([coords[y][0]+x,coords[y][1]-x])

CList.append([coords[y][0]-x,coords[y][1]-x])

CList.append([coords[y][0]-x,coords[y][1]+x])

for x in range(8):

for y in range(8):

if [x+1,y+1] in CList:

death=death+1

print 64-death