#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  double p_dis = 0, t, counter = 0, vp, vd, f, c, d_dis = 0;
  cin >> vp >> vd >> t >> f >> c;
  vp /= 3600, vd /= 3600, t *= 3600, f *= 3600;
  p_dis = t * vp;
  while (p_dis < c) {
    p_dis += vp;
    d_dis += vd;
    if (d_dis >= p_dis && p_dis < c) {
      counter++;
      d_dis = 0;
      p_dis += (vp * f) + ((p_dis / vd) * vp);
    }
  }
  cout << counter << endl;
  return 0;
}
