#include <stdio.h>

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

	scanf("%d %d %d %d %d %d", &aw, &ab, &bw, &bb, &c, &d);

	if (c > ab) {
		aw -= c - ab;
		bw += c - ab;
	}
	if (d > bw) aw += bw;
	else aw += d;

	printf("%d\n", aw);
	return 0;
}