import sys
def debug(*args):
    print(*args, file=sys.stderr)

sys.setrecursionlimit(2*(10**5))

H, W = map(int, input().split())
A, B = map(lambda x:int(x)-1, input().split())
R1, C1, R2, C2 = map(lambda x:int(x)-1, input().split())
P, Q = map(lambda x:int(x)-1, input().split())

val = 0
R3 = 0
C3 = 0

if A < R1:
    R3 = R1
elif R1 <= A <= R2:
    R3 = A
else:
    R3 = R2

if B < C1:
    C3 = C1
elif C1 <= B <= C2:
    C3 = B
else:
    C3 = C2

ret = abs(R3-A) + abs(C3-B) + abs(P-R3) + abs(Q-C3) + abs(A-P) + abs(B-Q)
print(ret)