#include <bits/stdc++.h>

using namespace std;

int main() {
    int aw, ab, bw, bb, c, d;
    cin >> aw >> ab >> bw >> bb >> c >> d;

    aw -= c - min(c, ab);
    //ab -= min(c, ab);
    bw += c - min(c, ab);
    //bb += min(c, ab);
    aw += min(d, bw);
    
    cout << aw << endl;
    return 0;
}