#include<iostream>
#include<vector>
using namespace std;
int main()
{
  int a,b,c,d,p,q,r,s,t;
  cin >> a >> b >> c >> d >> p >> q >> r >> s >> t;
  int cnt=0;
  cnt+=a*p;
  cnt+=b*q;
  cnt+=r*c;
  cnt+=d*s;
  if(cnt<=t)cout << "Yes" << endl;
  else cout << "No" << endl;
}