#include<stdio.h>
#include<iostream>
using namespace std;
int n, m, a, b, c, d;
int f(int x, int y){
	if(x<1 or x > n -(y+1)%2 or  y> d) return 0;
	if(x == c and y == d) return 1;
	return f(x-y%2,y+1)+f(x+1-y%2,y+1)+f(x+1,y);
}
int main(){
	for(int I=1;I<=20;I++){
		//sprintf(in,".%d.in",I);
	    //freopen(in,"w",stdout);
		cin >> n >> m;
		cin >> a >> b;
		cin >> c >> d;
		
		//printf(out,".%d.out",I);
	    //freopen(out,"w",stdout);
		cout << f(a, b);
	
	}
}