#include <bits/stdc++.h>
using namespace std;
int main() {
  double vp, vd, t, f, c;
  cin >> vp >> vd >> t >> f >> c;
  double curP = vp * t;
  double curD = 0;
  int count = 0;
  if (vd <= vp) {
    cout << "0";
    return 0;
  }
  while (curP < c) {
    t = curP / (vd - vp);
    curP = curP + vp * (t);
    if (curP >= c) break;
    count++;
    curP = curP + vp * (curP / vd + f);
  }
  cout << count << "\n";
}
