import sys
input = sys.stdin.readline

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

OK=0
NG=1<<63

while NG>OK+1:
    mid=(OK+NG)//2

    score=mid*P

    if A+B+C+D<mid*3:
        NG=mid
        continue

    fusoku=max(0,mid-A)+max(0,mid-B)+max(0,mid-C)

    score+=fusoku*Q

    if score<=R:
        OK=mid
    else:
        NG=mid

print(OK)