import sys

sys.setrecursionlimit(10 ** 6)
from typing import List, Tuple

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    h, w = vi()
    a, b = vi()
    r1, c1, r2, c2 = vi()
    p, q = vi()
    ans = float('inf')
    for r in range(r1, r2 + 1):
        for c in range(c1, c2 + 1):
            ans = min(ans, abs(a - r) + abs(b - c) + abs(r - p) + abs(c - q) + abs(a - p) + abs(b - q))
    return ans


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()