import sys
def input(): return sys.stdin.readline().rstrip()
def ii(f=int): return f(input())
def mi(f=int): return map(f, input().split())
def li(f=int): return list(map(f, mi()))


R, P, Q = mi()
A,B,C,D = mi()

def judge(x):
    t = max(0, x - A) + max(0, x - B) + max(0, x - C)
    ok = True
    ok &= D >= t
    ok &= R >= Q * t
    ok &= (R-Q*t) >= P*x
    return ok

ac = 0
wa = 10 ** 18
while wa - ac > 1:
    wj = (ac + wa) // 2
    if judge(wj):
        ac = wj
    else:
        wa = wj

print(ac)