program yuki3679
    implicit none
    integer h, w, a, b, r1, c1, r2, c2, p, q, x, y

    read (*,*) h, w
    read (*,*) a, b
    read (*,*) r1, c1, r2, c2
    read (*,*) p, q

    if (a < r1) then
        x = r1
    else if (a > r2) then
        x = r2
    else
        x = a
    end if

    if (b < c1) then
        y = c1
    else if (b > c2) then
        y = c2
    else
        y = b
    end if

    write (6,fmt='(I0)') abs(x-a) + abs(y-b) + abs(p-x) + abs(q-y) + abs(a-p) + abs(b-q)
end program yuki3679