#include <stdio.h>

int main () {
  long long h = 0LL;
  long long w = 0LL;
  long long la = 0LL;
  long long lb = 0LL;
  long long ka = 0LL;
  long long kb = 0LL;
  
  int res = 0;
  
  long long ans = 0LL;
  long long max = 0LL;
  
  res = scanf("%lld", &h);
  res = scanf("%lld", &w);
  res = scanf("%lld", &la);
  res = scanf("%lld", &lb);
  res = scanf("%lld", &ka);
  res = scanf("%lld", &kb);
  
  ans = h+w;
  max = h*w;
  if (kb > 0LL && max > 1LL+(h*w-1LL)/kb) {
    max = 1LL+(h*w-1LL)/kb;
  }
  
  for (long long a = 0LL; a <= h+w; a += 1LL) {
    long long tmp = 0LL;
    long long ar = la*a;
    long long b[2] = { -1LL, max };
    long long br = 0LL;
    if (ar > h) {
      ar = h;
    }
    while (b[1]-b[0] > 1LL) {
      long long nxt = (b[0]+b[1])/2LL;
      long long br = nxt*lb;
      if (br > w) {
        br = w;
      }
      if (h*w-ar*br > ka*a+kb*nxt) {
        b[0] = nxt;
      } else {
        b[1] = nxt;
      }
    }
    br = b[1]*lb;
    if (br > w) {
      br = w;
    }
    if (h*w-ar*br <= ka*a+kb*b[1] && a+b[1] < ans) {
      ans = a+b[1];
    }
  }
  
  printf("%lld\n", ans);
  return 0;
}