#include <bits/stdc++.h>
int main() {
  int i, j;
  double pv, dv, s, c, t, f, juli, t1;
  while (scanf("%lf%lf%lf%lf%lf", &pv, &dv, &t, &f, &c) != EOF) {
    int num = 0;
    s = juli = pv * t * 1.0;
    while (1) {
      if (pv > dv) break;
      t1 = juli * 1.0 / (dv - pv);
      s += t1 * pv;
      if (s < c) {
        num++;
        s += (t1 + f) * pv * 1.0;
        juli = s;
      } else {
        break;
      }
    }
    printf("%d\n", num);
  }
}
