#include <bits/stdc++.h>
int main() {
  int vp, vd, f, c, t, count = 0;
  float tf, dist, time;
  while (scanf("%d", &vp) != EOF) {
    scanf("%d%d%d%d", &vd, &t, &f, &c);
    time = t, dist = 0, count = 0;
    if (vp < vd) {
      while (dist < c) {
        dist += vp * time;
        tf = (dist / (vd - vp));
        dist += tf * vp;
        time = tf + f;
        if (dist >= c) break;
        count++;
      }
    }
    printf("%d\n", count);
  }
}
