#include <bits/stdc++.h>
using namespace std;
double fun(double d, double vd, double vp) { return d / abs(vd - vp); }
int main() {
  double vp, vd, t, f, c, cnt = 0;
  cin >> vp >> vd >> t >> f >> c;
  if (vp >= vd) {
    cout << "0" << endl;
    return 0;
  }
  double a, b, d, e, prince = 0, t1;
  d = vp * t;
  prince = d;
  t1 = fun(d, vp, vd);
  prince = prince + (t1 * vp);
  while (prince < c) {
    cnt++;
    double dragon = (prince / vd) + f;
    prince = prince + (dragon * vp);
    t1 = fun(prince, vp, vd);
    prince = prince + (t1 * vp);
  }
  cout << cnt << endl;
  return 0;
}
