r, p, q = map(int, input().split())
a, b, c, d = map(int, input().split())
L = 0
R = 1
def check(x):
    rem = d
    todo = 0
    if a < x: todo += x - a
    else: rem += a - x
    if b < x: todo += x - b
    else: rem += b - x
    if c < x: todo += x - c
    else: rem += c - x
    if todo > rem: return False
    cost = todo * q + x * p
    return cost <= r

while check(R):
    L = R
    R *= 2

while R - L > 1:
    mid = (L + R) // 2
    if check(mid):
        L = mid
    else:
        R = mid
print(L)