#include <bits/stdc++.h>
using namespace std;
int main() {
  double vp, vd, t, f, c;
  while (scanf("%lf", &vp) != EOF) {
    scanf("%lf%lf%lf%lf", &vd, &t, &f, &c);
    int ans = 0;
    double dis = t * vp;
    while (dis * vp < (c - dis) * (vd - vp) - 1e-9) {
      ans++;
      t += 2 * dis / (vd - vp);
      t += f;
      dis = t * vp;
    }
    printf("%d\n", ans);
  }
  return 0;
}
