#include <bits/stdc++.h>
using namespace std;
int main() {
  unsigned long long i, j, a, b, x, y, k;
  unsigned long long mark = 0;
  cin >> a >> b >> x >> y >> k;
  for (i = a, j = x; i <= b && j <= y;) {
    if ((double)i / (double)j == (double)k) {
      mark = 1;
      break;
    } else if ((double)i / (double)j <= (double)k)
      i++;
    else if ((double)i / (double)j >= (double)k)
      j++;
  }
  mark ? cout << "YES" << endl : cout << "NO" << endl;
  return 0;
}
