#include <bits/stdc++.h>
using namespace std;
int main() {
  int cnt = 0;
  double vp, vd, t, f, c, pos, td;
  cin >> vp >> vd >> t >> f >> c;
  pos = t * vp;
  if (vp >= vd) return cout << 0, 0;
  while (1) {
    td = pos / (vd - vp);
    if (pos + td * vp >= c) return cout << cnt, 0;
    cnt++;
    pos += td * vp;
    pos += (f + td) * vp;
  }
  return 0;
}
