#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:167772160")
using namespace std;
const double pi = 2 * acos(0.0);
double v1, v2, t, f, c, x, xx, tt;
int ans;
int main() {
  cin >> v1 >> v2 >> t >> f >> c;
  if (v2 <= v1) {
    cout << "0" << endl;
    return 0;
  }
  ans = 0;
  x = v1 * t;
  while (x < c) {
    double tt = (x / (v2 - v1));
    xx = x + tt * v1;
    if (xx < c) {
      ans++;
      xx = xx + v1 * (xx / v2 + f);
      x = xx;
    } else
      break;
  }
  cout << ans << endl;
}
