#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int Vp, Vd, t, f, c;
  cin >> Vp >> Vd >> t >> f >> c;
  if (Vp >= Vd) {
    cout << "0\n";
    return 0;
  }
  double princess_position = Vp * t;
  double dragon_position;
  double time;
  int count = 0;
  while (true) {
    time = princess_position / (Vd - Vp);
    princess_position += Vp * time;
    if (princess_position >= c) break;
    count++;
    time = princess_position / Vd + f;
    princess_position += Vp * time;
  }
  cout << count << endl;
}
