/* -*- coding: utf-8 -*-
 *
 * 3064.cc:  No.3064 Speedrun (Easy) - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int a, b, c, d, p, q, r, s, t;
  scanf("%d%d%d%d%d%d%d%d%d", &a, &b, &c, &d, &p, &q, &r, &s, &t);

  int sum = a * p + b * q + c * r + d * s;

  if (sum <= t) puts("Yes");
  else puts("No");

  return 0;
}