#include <bits/stdc++.h>
using namespace std;
int fastio() {
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  cin.tie(nullptr);
  return 0;
}
int __fastio = fastio();
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
void solve() {
  double p, d, t, f, c;
  cin >> d >> p >> t >> f >> c;
  double cur = d * t;
  ;
  if (d >= p) {
    cout << 0;
    return;
  }
  double diff = p - d;
  int res = 0;
  while (cur < c) {
    double times = cur / diff;
    double nxtcur = cur + times * d;
    if (nxtcur >= c) {
      break;
    }
    res++;
    double timeback = times + f;
    cur = nxtcur + timeback * d;
  }
  cout << res;
}
int main() {
  int t = 1;
  while (t--) {
    solve();
  }
}
