#include <bits/stdc++.h>
using namespace std;
int main() {
  double vd, vp, c, t, f;
  int ans = 0;
  cin >> vp >> vd >> t >> f >> c;
  if (vp >= vd) {
    cout << 0 << endl;
    return 0;
  }
  double l = vp * t;
  double real_l = l + l * 1.0 / (vd - vp) * vp;
  while (real_l < c) {
    ans++;
    double ti = f + real_l * 1.0 / vd;
    l = real_l + vp * ti;
    real_l = l + l * 1.0 / (vd - vp) * vp;
  }
  cout << ans << endl;
  return 0;
}
