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