#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>
#include <bitset>
#include <cassert>

using namespace std;

int main() {

    int Aw, Ab;
    cin >> Aw >> Ab;
    int Bw, Bb;
    cin >> Bw >> Bb;
    int C, D;
    cin >> C >> D;

    cout << min(D, Bw + min(Aw, C)) << endl;

    return 0;

}