#include <bits/stdc++.h>
using namespace std;
int main() {
  float p, d, t, f, c;
  cin >> p >> d >> t >> f >> c;
  float ans = 0;
  if (p > d) {
    cout << 0;
    return 0;
  }
  float time = t;
  while (p * time < c) {
    if (p * (time + ((p * time) / (d - p))) < c) {
      ans++;
      time += (2 * (p * time) / (d - p)) + f;
    } else
      break;
  }
  cout << ans;
}
