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