#include <bits/stdc++.h>
int main(void) {
  float vp, vd, f, t, c;
  scanf("%f%f%f%f%f", &vp, &vd, &t, &f, &c);
  float rd;
  int bijous = 0;
  if (vp > vd) {
    printf("0");
    return 0;
  }
  rd = vp * t;
  rd += vp * rd / (vd - vp);
  for (bijous = 0; rd < c; bijous++) {
    rd += vp * (rd / vd + f);
    rd += vp * rd / (vd - vp);
  }
  printf("%d", bijous);
  return 0;
}
