R, P, Q = map(int, input().split())
A, B, C, D = map(int, input().split())

def check(X):
	S = max(0, X - A) + max(0, X - B) + max(0, X - C)
	T = max(0, A - X) + max(0, B - X) + max(0, C - X) + D
	if S > T:
		return False
	return (P * X + S * Q <= R)

ok, ng = 0, 10 ** 10
while ng - ok > 1:
	mid = (ok + ng) // 2
	if check(mid):
		ok = mid
	else:
		ng = mid
print(ok)