R, P, Q = map(int, input().split())
r, y, b, g = map(int, input().split())


ok = 0
ng = (r+y+b+g) // 3 + 1

while ng - ok > 1:
    m = (ok + ng ) // 2

    cost = m * P
    cost += max(0, m-r) * Q
    cost += max(0, m-y) * Q 
    cost += max(0, m-b) * Q

    # print("#", m, cost)

    if cost <= R:
        ok = m
    else:
        ng = m

print(ok)