#include <bits/stdc++.h>
using namespace std;
int ans = 0;
int main() {
  double vp, vd, t, f, c, dp = 0, dd = 0, w, fora, t_;
  bool ff = false;
  cin >> vp >> vd >> t >> f >> c;
  fora = t;
  if (vp >= vd) {
    cout << 0;
    return 0;
  }
  while (true) {
    if (abs(fora * vp - c) < 0.0001 || fora * vp > c) break;
    t_ = vp * fora / (vd - vp);
    if ((fora + t_) * vp < c) ans++;
    fora += t_;
    fora += fora * vp / vd + f;
  }
  cout << ans << endl;
  return 0;
}
