h,w,la,lb,ka,kb = map(int,input().split())

l = 0
r = h+w
while r-l > 1:
  m = (r+l)//2
  mx = 0
  for a in range(m+1):
    b = m-a
    tmp = min(h,la*a) * min(w,lb*b) + ka*a + kb * b 
    mx = max(mx,tmp)
  if mx >= h*w:
    r = m
  else:
    l = m
print(r)