aw,ab=map(int,input().split())
bw,bb=map(int,input().split())
c,d=map(int,input().split())

if ab<=c:
    bb+=ab
    w=c-ab
    aw-=w
    bw+=w
else:
    bb+=c
if d<=bw:
    aw+=d
else:
    aw+=bw

print(aw)