#include <bits/stdc++.h>
using namespace std;
const double dx[] = {0, -1, 0, 1};
const double dy[] = {-1, 0, 1, 0};
const double INF = 2e9;
const double nax = 1e5 + 10;
const double M = 1e9 + 7;
void mini(double &a, double b) { a = min(a, b); }
void maxi(double &a, double b) { a = max(a, b); }
void solve() {
  double vp, vd, t, f, c;
  cin >> vp >> vd >> t >> f >> c;
  if (vd - vp <= 1e-5) {
    cout << "0";
    return;
  }
  double ppos, t2dp, t2ds;
  long long ans = 0;
  ppos = t * vp;
  ppos += ppos / (vd - vp) * vp;
  while (ppos < c) {
    ans++;
    t2ds = ppos / vd + f;
    ppos += vp * t2ds;
    t2dp = ppos / (vd - vp);
    ppos += vp * t2dp;
  }
  cout << ans;
}
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cerr.tie(0);
  ;
  double tt = 1;
  while (tt--) {
    solve();
  }
  return 0;
}
