#include <bits/stdc++.h>
using namespace std;
const long long M = 2 * 1e5 + 7, mod = 998244353;
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  long double vp, vd, t, f, c;
  cin >> vp >> vd >> t >> f >> c;
  if (vp > vd) return cout << 0, 0;
  long double x = t * vp;
  long long ans = 0;
  while (x < c) {
    long double time = (long double)x / (vd - vp);
    long double dist = x + time * vp;
    if (dist < c)
      ans++;
    else
      break;
    x = dist + (((long double)dist / vd) + f) * vp;
  }
  cout << ans;
  return 0;
}
