#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
const long long INF = 1e18;
const long long N = 1e5 + 7;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  ;
  double vp, vd, t, first, c;
  cin >> vp >> vd >> t >> first >> c;
  int ans = 0;
  double distp = vp * t;
  if (vd <= vp) {
    cout << 0;
    return 0;
  }
  while (true) {
    if (distp >= c) break;
    double time = distp / (vd - vp);
    distp += (vp * time);
    if (distp >= c) break;
    ans++;
    double timegained = (distp / vd) + first;
    distp += (vp * timegained);
  }
  cout << ans;
  return 0;
}
