#include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
#include <algorithm>
using namespace std;
using ll = long long;
constexpr ll M = 1e9+7;

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