#include <bits/stdc++.h>
using namespace std;
double vp, vd, t, f, c;
int main() {
  cin >> vp >> vd >> t >> f >> c;
  if (vp >= vd) {
    cout << "0";
    return 0;
  }
  int numberOfBojous = 0;
  double timeToHaveTheDragonBack = 0, overtakePosition = 0;
  double princessPosition = vp * t;
  while (princessPosition < c) {
    overtakePosition = vd * princessPosition / (vd - vp);
    if (overtakePosition < c) numberOfBojous++;
    timeToHaveTheDragonBack = (overtakePosition / vd) + f;
    princessPosition = (vp * timeToHaveTheDragonBack) + overtakePosition;
  }
  cout << numberOfBojous;
  return 0;
}
