#include <bits/stdc++.h>
using namespace std;
const double EPS = 1e-10;
int main() {
  int vp, vd, t, f, c;
  cin >> vp >> vd >> t >> f >> c;
  int cnt = 0;
  if (vp < vd) {
    double xp(t * vp);
    for (;;) {
      double t = xp / double(vd - vp);
      double xd = t * double(vd);
      if (xd + EPS >= double(c)) break;
      double t0 = xd / double(vd) + double(f);
      xp += double(vp) * (t + t0);
      ++cnt;
    }
  }
  cout << cnt << endl;
}
