#include <bits/stdc++.h>
int main() {
  double vp, vd, t, f, c, dp = 0, dd = 0;
  int bijous = 0;
  scanf("%lf %lf %lf %lf %lf", &vp, &vd, &t, &f, &c);
  if (vp >= vd) {
    printf("0\n");
  } else {
    dp = vp * t;
    dd = vd * (dp) / (vd - vp);
    dp = dd;
    while (dp < c) {
      bijous++;
      dp += vp * ((dd / vd) + f);
      dd = vd * (dp) / (vd - vp);
      dp = dd;
    }
    printf("%d\n", bijous);
  }
  return 0;
}
