#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        int a, b, c, d;
        cin >> a >> b >> c >> d;
        int x, y;
        cin >> x >> y;
        if (b >= x) {
            d += x;
            b -=x;
        }
        else {
            d += b; x -= b; b = 0;
            a -= x; c += x;
        }
        
        if (c >= y) {
            a += y; c -= y;
        }
        else {
            a += c; y -= c; c = 0;
            d -= y; b += y;
        }
        cout << a;
    }
    return 0;
}