#include <bits/stdc++.h>
using namespace std;
int main() {
  int vp, vd, t, f, c, cnt = 0;
  scanf("%d%d%d%d%d", &vp, &vd, &t, &f, &c);
  if (vd <= vp) return puts("0") & 0;
  double len = t * vp, use = t, eps = 1e-9;
  while (1) {
    use += len / (vd - vp);
    if (use * vp > c - eps) break;
    cnt++;
    use += use * vp / vd + f;
    len = use * vp;
  }
  printf("%d\n", cnt);
}
