H,W=map(int,input().split())
A,B=map(int,input().split())
R1,C1,R2,C2=map(int,input().split())
P,Q=map(int,input().split())
T1=0
T2=0
ANS=0
if A<R1:
    T1=R1
    ANS+=abs(R1-A)
elif R1<=A<=R2:
    T1=A
else:
    T1=R2
    ANS+=abs(R2-A)
if B<C1:
    T2=C1
    ANS+=abs(C1-B)
elif C1<=B<=C2:
    T2=B
else:
    T2=C2
    ANS+=abs(C2-B)
ANS+=abs(P-T1)
ANS+=abs(Q-T2)
ANS+=abs(P-A)
ANS+=abs(Q-B)
print(ANS)