#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cmath>

using namespace std;
typedef long long ll;

int main(void) {
    int aw, ab, bw, bb, c, d;
    cin >> aw >> ab;
    cin >> bw >> bb;
    cin >> c >> d;
    {
        int tmp = min(c, ab);
        aw -= c-tmp;
        bw += c-tmp;
        bb += tmp;
    }
    {
        int tmp = min(d, bw);
        aw += tmp;
    }
    cout << aw << endl;
    return 0;
}