#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int t = 1;
  while (t--) {
    double vp, vd, t, f, c;
    cin >> vp >> vd >> t >> f >> c;
    double track1, track2;
    int ans = 0;
    track1 = vp * t;
    track2 = 0;
    if (vp >= vd) {
      cout << 0;
      return 0;
    }
    while (track1 < c) {
      double curr_dis = track1 - track2;
      double time = curr_dis / (vd - vp);
      track1 += vp * time;
      track2 += vd * time;
      if (track1 < c) ans++;
      track2 = 0;
      track1 += vp * (time + f);
    }
    cout << ans;
  }
  return 0;
}
