import sys
sys.setrecursionlimit(10**6)
import pypyjit
pypyjit.set_param('max_unroll_recursion=-1')

H,W=map(int,input().split())
Si,Sj=map(int,input().split())
Gi,Gj=map(int,input().split())
Si-=1
Sj-=1
Gi-=1
Gj-=1

ds = [[1,0],[-1,0],[0,1],[0,-1]]
ans=0
use = set()
def solve(x, y):
    #print(x, y, use)
    global ans
    if x==Gi and y==Gj:
        ans+=1
        return 
    use.add((x,y))
    for d in ds:
        x_ = x+d[0]
        y_ = y+d[1]
        if 0<=x_<H and 0<=y_<W:
            if (x_, y_) in use:
                continue
            flag = True
            for d2 in ds:
                x2_ = x_+d2[0]
                y2_ = y_+d2[1]
                if not (x2_ == x and y2_ == y) and (x2_,y2_) in use:
                    flag = False
            if flag:
                solve(x_, y_)
    use.discard((x,y))
    
solve(Si,Sj)
print(ans)