#include <bits/stdc++.h>
using namespace std;
vector<pair<double, double>> v;
int main(void) {
  cin.tie(0), iostream::sync_with_stdio(0);
  double vp, vd, t, f, c, dp, d2, count = 0;
  cin >> vp >> vd >> t >> f >> c;
  dp = vp * t;
  d2 = 0;
  if (vp > vd) {
    cout << 0;
    return 0;
  }
  while (dp < c) {
    double td = dp / (vd - vp);
    dp += td * vp;
    if (dp >= c) {
      cout << count;
      return 0;
    }
    count++;
    double t_back = dp / vd + f;
    dp += t_back * vp;
  }
  cout << count;
}
