import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
h,w,la,lb,ka,kb = na()

ok = 2*10**6
ng = 0
while ok - ng > 1:
    d = ok + ng >> 1
    a = 0
    for x in range(d + 1):
        y = d - x
        res = h * w - min(x * la, h) * min(y * lb, w)
        if res <= ka * x + kb * y:
            a = 1
            break
    if a:
        ok = d
    else:
        ng = d

print(ok)