#include <bits/stdc++.h>
using namespace std;
int main() {
  std::ios::sync_with_stdio(false);
  double vp, vd, t, f, c;
  cin >> vp >> vd >> t >> f >> c;
  int ans = 0;
  if (vd < vp || (vd == vp && t > 0)) {
    cout << 0;
    return 0;
  }
  if (vd == vp) {
    cout << 1;
    return 0;
  }
  double maxn = max(vp, vd), mini = min(vp, vd);
  double done = vp * t;
  done += vp * (done) / (maxn - mini);
  while (done < c) {
    ans++;
    done += (f + (done / vd)) * vp;
    done += (vp * done) / (maxn - mini);
  }
  cout << ans;
  return 0;
}
