#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) REP(i, 0, n)
#define REP(i, s, e) for (int i = (s); i < (int)(e); i++)
#define repr(i, n) REPR(i, n, 0)
#define REPR(i, s, e) for (int i = (int)(s - 1); i >= (int)(e); i--)
#define all(r) r.begin(), r.end()
#define rall(r) r.rbegin(), r.rend()

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;

template <typename T>
T chmax(T& a, const T& b) { return a = (a > b ? a : b); }
template <typename T>
T chmin(T& a, const T& b) { return a = (a < b ? a : b); }
void yes_no(bool f, string yes = "Yes", string no = "No") { cout << (f ? yes : no) << "\n"; }

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll a, b, c, d, s;
    cin >> a >> b >> c >> d >> s;
    yes_no(a * c + b * d <= s);
    return 0;
}