#coding: utf-8
##yuki_268

l=map(int,raw_input().split())
c=map(int,raw_input().split())

l.sort()
c.sort()

res=(l[0]+l[1])*2*c[2]
res+=(l[0]+l[2])*2*c[1]
res+=(l[1]+l[2])*2*c[0]

print res