#include <bits/stdc++.h>
using namespace std;
double eps = 1e-8;
int judge(double a, double b) {
  if (fabs(a - b) < eps)
    return 0;
  else if (a - b > 0)
    return 1;
  else
    return -1;
}
int main() {
  int vp, vd, t, f;
  double ls;
  cin >> vp >> vd >> t >> f >> ls;
  if (vp >= vd) {
    cout << "0" << endl;
    return 0;
  }
  double sum = vp * t;
  int ans = 0;
  while (1) {
    double s = sum / (vd - vp);
    sum += s * vp;
    if (judge(sum, ls) >= 0) break;
    sum += (s + f) * vp;
    ans++;
  }
  cout << ans << endl;
  return 0;
}
