#include <iostream>
using namespace std;
int main(void) {
	int aw, ab, bw, bb, c, d;
	cin >> aw >> ab >> bw >> bb >> c >> d;
	//move only black stones as many as possible
	int first = min(ab, c);
	c -= first;
	int second = min(aw, c);
	aw -= second;
	bw += second;
	//move only white stones
	int third = min(bw, d);
	aw += third;
	cout << aw << endl;
	return 0;
}