import sys
sys.setrecursionlimit(10**8)
H,W = map(int,input().split())
si,sj = map(lambda x:int(x)-1,input().split())
gi,gj = map(lambda x:int(x)-1,input().split())

D = {'R':(0,1), 'D':(1,0), 'L':(0,-1), 'U':(-1,0)}
R = {'R':'L', 'D':'U', 'L':'R', 'U':'D', '_':'*'}
S = {'R':'UD', 'D':'LR', 'L':'UD', 'U':'LR', '_':''}

ans = 0
def rec(i,j,p,pp):
    global ans
    if (i,j)==(gi,gj):
        ans += 1
        return
    for d,(di,dj) in D.items():
        if d==R[p]: continue
        ni,nj = i+di,j+dj
        if not (0<=ni<H and 0<=nj<W): continue
        np,npp = d,p
        if R[d]==pp and p in S[d]: continue
        rec(ni,nj,np,npp)
rec(si,sj,'_','_')

print(ans)