#include <bits/stdc++.h>
using namespace std;
const int N = 2e6 + 5, inf = 1e9 + 7;
int main() {
  ios_base ::sync_with_stdio(0);
  cin.tie(0);
  double l, r;
  cin >> l >> r;
  double x, y;
  cin >> x >> y;
  double k;
  cin >> k;
  for (double i = x; i <= y; i++) {
    double x = i * k;
    if (x >= l && x <= r) {
      cout << "YES";
      return 0;
    }
  }
  cout << "NO";
  return 0;
}
