#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cstring>
const int L = 1 << 8;
char buffer[L], *S, *T;
#define initbuffer(); {T=(S=buffer)+fread(buffer,1,L,stdin); while(!isdigit(*T))T--;T++;}
#define getint() (S!=T?strtol(S,&S,10):-1)
int a[52][52], n, m, sx, sy, dx, dy;
int dfs(int i, int j)
{
	if (a[i][j] != -1) return a[i][j];
	else if (i == dx&&j == dy) return a[i][j] = 1;
	else
	{
		int ans = 0;
		if (i + 2 <= dx&&j + 1 <= m)
			ans += dfs(i + 2, j + 1);
		if (i + 2 <= dx&&j - 1 >= 1)
			ans += dfs(i + 2, j - 1);
		if (i + 1 <= dx&&j + 2 <= m)
			ans += dfs(i + 1, j + 2);
		if (i + 1 <= dx&&j - 2 >= 1)
			ans += dfs(i + 1, j - 2);
		return a[i][j] = ans;
	}
}
int main()
{
	initbuffer();
	n = getint(), m = getint(), sx = getint(), sy = getint(), dx = getint(), dy = getint();
	memset(a, -1, sizeof(a));
	printf("%d", dfs(sx, sy));
	return 0;
}