#include <bits/stdc++.h>
using namespace std;
int main() {
  double v1, v2, s1, s2, t, f, c;
  double m;
  int co;
  while (cin >> v1 >> v2 >> t >> f >> c) {
    if (v2 <= v1)
      cout << 0 << endl;
    else {
      s1 = t * v1;
      s2 = 0;
      m = v2 - v1;
      co = 0;
      while (s1 < c) {
        s1 += (s1 / m) * v1;
        if (s1 >= c) break;
        co++;
        s1 += (s1 / v2 + f) * v1;
      }
      cout << co << endl;
    }
  }
  return 0;
}
