r, p, q = map(int, input().split())
a, b, c, d = map(int, input().split())

mi = min(a, b, c, r//p)
ans = mi
a -= mi
b -= mi
c -= mi
r -= mi*p

left, right = 0, int(2e9)

while right-left>1:
    mid = (left+right)//2
    ch = 0
    ch += max(0, mid-a)+max(0, mid-b)+max(0, mid-c)
    need = ch*q+p*mid
    if need <= r: left = mid
    else: right = mid

print(ans+left)