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