C++ :

#include<bits/stdc++.h>
using namespace std;
int p,a,b,c,d;
int main()
{
//	freopen("750.in","r",stdin);	
//	freopen("750.out","w",stdout);
	cin>>p>>a>>b>>c>>d;
	if(a==c && b==d) {cout<<0;return 0;}
	int he1=a+b,cha1=a-b;
	int he2=c+d,cha2=c-d;
	if(he1==he2 || cha1==cha2) cout<<1;
	else if(he1%2==he2%2) cout<<2;
		else cout<<-1;
	return 0;	 
}