#include <algorithm>
#include <array>
#include <cmath>
#include <cstdio>
#include <iostream>
#include <numeric>
#include <optional>
#include <vector>

using namespace std;

int main() {
    int32_t aw, ab, bw, bb, c, d;
    cin >> aw >> ab >> bw >> bb >> c >> d;
    auto b = min(ab, c), w = c - b;
    aw -= w;
    ab -= b;
    bw += w;
    bb += b;
    w = min(bw, d);
    cout << aw + w << endl;
    return 0;
}