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

INF = 1<<60

def func(cnt):
    cnt = max(cnt-A, 0)+max(cnt-B, 0)+max(cnt-C, 0)
    return cnt*Q

left = 0
right = min(R//P, (A+B+C+D)//3)+1
while left+1 < right:
    mid = (left+right)//2
    if func(mid) <= R-(P*mid):
        left = mid
    else:
        right = mid

print(left)