#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 (ab < c)
	{
		bw += c - ab;
		aw -= c - ab;
	}
	if (bw < d)
		aw += bw;
	else
		aw += d;
	printf("%d\n", aw);
	return 0;
}