#include<bits/stdc++.h> using namespace std; int main() { int n,m,n1,m1,n2,m2; cin>>n>>m>>n1>>m1>>n2>>m2; int one=n-1+m-1,tow=n1-1+m1-1+n-n2+m-m2,t=n2-1+m2-1+n-n1+m-m1; cout<<min(one,min(tow,t)); return 0; }