#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int a, b, x, y;
  double k;
  cin >> a >> b >> x >> y >> k;
  for (long long int i = x; i <= y; i++) {
    long long int r = 1.0 * i * k;
    if (r >= a && r <= b) {
      cout << "YES";
      return 0;
    }
  }
  cout << "NO";
  return 0;
}
