#include <bits/stdc++.h>
using namespace std;
int main() {
  double vd, vp, t, f, c;
  double time, x;
  double count = 0;
  cin >> vp >> vd >> t >> f >> c;
  x = c;
  if (vp >= vd)
    cout << 0 << endl;
  else {
    while (x > 0) {
      time = vp * t / (vd - vp);
      x = c - vp * (t + time);
      if (x > 0) {
        count++;
        t = t + time * 2 + f;
      }
    }
    cout << count << endl;
  }
  return 0;
}
