#include <bits/stdc++.h>
using namespace std;
const int maxn = 1000000 + 10;
const int INF = 1e9 + 7;
const int MOD = 1e9 + 7;
const double eps = 1e-10;
const double pi = acos(-1);
int T, cases, n, m;
int main() {
  ios::sync_with_stdio(false);
  ;
  int vp, vd, t, f, c, ans = 0;
  cin >> vp >> vd >> t >> f >> c;
  if (vd <= vp) {
    cout << "0" << endl;
    return 0;
  }
  double sp = vp * t;
  double time = t;
  while (sp < c) {
    double tmp = 1.0 * sp / (vd - vp);
    time += tmp;
    sp = sp + vp * tmp;
    if (sp >= c) break;
    ans++;
    sp = sp + vp * (f + sp / vd);
  }
  cout << ans << endl;
  return 0;
}
