print((function (aw, ab, bw, _, c, d)
	if c>ab then aw,bw = aw-c+ab,bw+c-ab end
	return aw + (d>bw and bw or d)
end)(io.stdin:read("*n"), io.stdin:read("*n"), io.stdin:read("*n"), io.stdin:read("*n"), io.stdin:read("*n"), io.stdin:read("*n")))