#include <bits/stdc++.h>
using namespace std;
int main() {
  double vp, vd, time, f, c;
  cin >> vp >> vd >> time >> f >> c;
  double y, t;
  y = time * vp;
  if (vp >= vd) {
    cout << 0;
    return 0;
  }
  if (time * vp >= c) {
    cout << 0;
    return 0;
  }
  double temp, temp2;
  int res = 0;
  while (true) {
    t = y / (vd - vp);
    temp = t * vp;
    y += temp;
    if (y >= c) break;
    res++;
    temp = f * vp;
    temp2 = y / vd;
    temp += temp2 * vp;
    y += temp;
    temp = 0;
    if (y >= c) break;
  }
  cout << res;
  return 0;
}
