#include <bits/stdc++.h>
using namespace std;
int vp, vd, time_s, time_b, dist;
int main() {
  scanf("%d%d%d%d%d", &vp, &vd, &time_s, &time_b, &dist);
  if (vd <= vp) {
    puts("0");
    return 0;
  }
  int ans = 0;
  double now = 1.0 * vp * time_s;
  while (now < dist) {
    double Overtake = now / (vd - vp);
    double loc = now + Overtake * vp;
    if (loc >= dist) break;
    ++ans;
    now = loc;
    double Back = now / vd + 1.0 * time_b;
    now += Back * vp;
  }
  printf("%d\n", ans);
  return 0;
}
