r,p,q=map(int,input().split())
a,b,c,d=map(int,input().split())
left=0;right=10**10
while left+1<right:
	mid=(left+right)//2 
	z=max(0,mid-a)+max(0,mid-b)+max(0,mid-c)
	if a+b+c+d<3*mid or (z*q+mid*p)>r:
		right=mid 
	else:
		left=mid 
print(left)