#include <bits/stdc++.h>
using namespace std;
float a, b, c, d, e = 0, f, g, h, k, n, m, t, vp, vd, x, ans;
int main() {
  cin >> vp >> vd >> t >> f >> c;
  if (vd <= vp) {
    cout << 0 << endl;
    return 0;
  }
  ans = vd * t * vp / (vd - vp);
  if (ans >= c) {
    cout << 0 << endl;
    return 0;
  }
  e++;
  while (1) {
    d = (2 * ans * vp) / vd + f * vp;
    g = d / (vd - vp);
    ans = vd * g + ans;
    if (ans >= c) break;
    e++;
  }
  int xx = e;
  cout << xx << endl;
}
