#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>



using namespace std;




int main() {

	long long int a,b,c,d;
	cin>>a>>b>>c>>d;
	int n,m;
	cin>>n>>m;
	if(n<=b)d+=n,b-=n;
	else {
		d+=b;
		a-=n-b;
		c+=n-b;
		b=0;
	}
	if(m<=c)a+=m;
	else{
		a+=c;
	}
	cout<<a<<endl;
	
	return 0;
}