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())

def move(i, j, i2, j2):
    return abs(i - i2) + abs(j - j2)

ans = 0

# 接近
if R1 <= A <= R2 and C1 <= B <= C2: # すでに領域にいる
    ans += 0
    X, Y = A, B
elif R1 <= A <= R2:
    X = A
    if B < C1:
        ans += C1 - B
        Y = C1
    else:
        ans += B - C2
        Y = C2
elif C1 <= B <= C2:
    Y = B
    if A < R1:
        ans += R1 - A
        X = R1
    else:
        ans += A - R2
        X = R2
else:
    if A < R1 and B < C1:
        ans += move(A, B, R1, C1)
        X, Y = R1, C1
    elif A < R1 and B > C2:
        ans += move(A, B, R1, C2)
        X, Y = R1, C2
    elif A > R2 and B < C1:
        ans += move(A, B, R2, C1)
        X, Y = R2, C1
    else:
        ans += move(A, B, R2, C2)
        X, Y = R2, C2

# 処分
ans += move(X, Y, P, Q)

# 帰還
ans += move(P, Q, A, B)

print(ans)