#include <bits/stdc++.h>
using namespace std;
int main() {
  float vp, vd, t, f, c;
  cin >> vp >> vd >> t >> f >> c;
  float d, p;
  p = vp * t;
  int count = 0;
  while (vd > vp) {
    d = p / (vd - vp);
    p += d * vp;
    if (p >= c) break;
    count++;
    p += (d + f) * vp;
  }
  cout << count;
}
