#include <bits/stdc++.h>
using namespace std;
int vp, vd, t, f, c, ret;
double tms, tt, pos;
int main() {
  scanf("%d%d%d%d%d", &vp, &vd, &t, &f, &c);
  if (vp >= vd) {
    printf("0\n");
    return 0;
  }
  tms = t;
  while (vp * tms + 1e-8 < c) {
    pos = vp * tms;
    tms += pos / (vd - vp);
    pos = vp * tms;
    if (pos + 1e-8 >= c) break;
    ret++;
    tms += pos / vd + f;
  }
  printf("%d\n", ret);
  return 0;
}
