// بسم الله الرحمن الرحيم
#include <bits/stdc++.h>
using namespace std;
template<typename T> ostream& operator<<(ostream& os, vector<T>& v) { for (auto& i : v) os << i << ' '; return os; }
template<typename T> istream& operator>>(istream& is, vector<T>& v) { for (auto& i : v) is >> i; return is; }
#define FreePalestine ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define endl '\n'
#define int long long
#define ull unsigned long long
#define vi vector<int>
#define vvi vector<vi>
#define pi pair<int, int>
#define all(a) a.begin(), a.end()
#define all_r(a) a.rbegin(), a.rend()
const int N = 2e5, oo = 2e18, MOD = 1e9+7;
void solve() {
int x, d, p, n, m; cin >> x >> d >> p >> n >> m;
int t = ((p + m - 1) / m) * n + d;
if (t <= x) {
cout << "YES\n";
} else {
cout << "NO\n";
}
}
signed main() {
FreePalestine;
// #ifndef ONLINE_JUDGE
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
// #endif
int t; t = 1;
// cin >> t;
while (t--) solve();
return 0;
}
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