R, P, Q = [int(s) for s in input().split()]
A, B, C, D = [int(s) for s in input().split()]


def is_valid(mid):
    if (A + B + C + D) // 3 < mid:
        return False

    lack = max(mid - A, 0) + max(mid - B, 0) + max(mid - C, 0)
    return P * mid + lack * Q <= R


ok, ng = 0, 10**18
while abs(ok - ng) > 1:
    mid = (ok + ng) // 2
    if is_valid(mid):
        ok = mid
    else:
        ng = mid

print(ok)