#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <map>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <algorithm>
#include <array>
#include <unordered_set>
#include <unordered_map>
#include <string>
using namespace std;

bool rcmp(int a, int b) { return a>b; }
typedef long long LL;


int gw, gh, la, lb, ka, kb;
char check(int r, int c) {
    LL rc=r; rc*=la;
    LL cc=c; cc*=lb;
    if (rc>gh) rc=gh;
    if (cc>gw) cc=gw;
    LL xx=(gh-rc)*gw+(gw-cc)*gh-(gh-rc)*(gw-cc);
    rc=r; rc*=ka;
    cc=c; cc*=kb;
    if (xx<=rc+cc) return 1;
    return 0;
}
int main() {
    int n, i, j, r, d, nj, x;
    int h, w;
    LL v, t;
    scanf("%d %d %d %d %d %d", &h, &w, &la, &lb, &ka, &kb);
    gh=h; gw=w;
    r = h+w;
    for (i=0; i<=h; i++) {
        x=i*la; if (x>=h) x=0; else x=(h-x)*w;
        v=ka; v*=i;  t=kb; t*=w; t*=h;
        if (v+t<x) continue;
        j=-1; d=max(x, w); while(d) {
            while(1) {
                nj=j+d; if (nj>w) break;
                if (check(i, nj)) break;
                j=nj;
            }
            d>>=1;
        }
        j++;
        r = min(r, i+j);
    }
    printf("%d\n", r);
    return 0;
}