#include <bits/stdc++.h> 

using namespace std;
typedef long long ll;
const ll MOD = 1e9 + 7;

int main() {
	int Aw, Ab;
	int Bw, Bb;
	int C, D;
	cin >> Aw >> Ab >> Bw >> Bb >> C >> D;
	int move;
	move = min(Ab, C);
	C -= move;
	Bb += move;
	Ab -= move;
	move = min(Aw, C);
	Bw += move;
	Aw -= move;

	move = min(Bw, D);
	Aw += move;
	cout << Aw << endl;
}