#include <bits/stdc++.h>
using namespace std;
int main() {
  double Vp, Vd, t, f, c;
  while (cin >> Vp >> Vd >> t >> f >> c) {
    double Xsum = t * Vp;
    int bi = 0;
    double tt = 0;
    if (Vd <= Vp) {
      cout << "0" << endl;
      continue;
    }
    while (Xsum < c) {
      t = Xsum / (Vd - Vp);
      Xsum += t * Vp;
      if (Xsum >= c) break;
      bi++;
      tt = Xsum / Vd + f;
      Xsum += tt * Vp;
    }
    cout << bi << endl;
  }
}
