#include <bits/stdc++.h>
using namespace std;
int main() {
  int vp, vd, t, f, c;
  cin >> vp >> vd >> t >> f >> c;
  int ret = 0;
  double res = t * vp;
  while (true) {
    if (res >= c) break;
    if (vp < vd) {
      double dist = vd * (res / (double)(vd - vp));
      if (dist < c) {
        ret++;
        res = dist;
        res += (res / vd) * vp + (double)f * vp;
      } else
        res += (double)vp;
    } else
      break;
  }
  cout << ret << "\n";
}
