#include <bits/stdc++.h>
double vp, vd, t, f, c;
int main() {
  scanf("%lf%lf%lf%lf%lf", &vp, &vd, &t, &f, &c);
  double x = vp * t;
  int ans = 0;
  if (vp > vd) {
    puts("0");
    return 0;
  }
  while (x + 1e-6 < c) {
    double needtime = x / (vd - vp);
    double willx = x + needtime * vp;
    if (willx + 1e-6 >= c) break;
    ans++;
    t += needtime * 2 + f;
    x = vp * t;
  }
  printf("%d\n", ans);
  return 0;
}
