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