#include <bits/stdc++.h>
using namespace std;
long long cnt = 0;
double vp, vd, t, f, c;
void fun(double dis) {
  double x = (dis * vd) / (vd - vp);
  if (x >= c) return;
  cnt++;
  fun(x + (vp * x) / vd + f * vp);
}
void solve() {
  cin >> vp >> vd >> t >> f >> c;
  if (vp >= vd) {
    cout << 0 << "\n";
    return;
  }
  fun(t * vp);
  cout << cnt << "\n";
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cout << fixed;
  cout << setprecision(6);
  solve();
}
long long modPow(long long a, long long b) {
  if (b == 0) return 1;
  if (b % 2 == 0) {
    long long x = a * a;
    x %= 1000000007;
    return modPow(x, b / 2);
  }
  return (a * modPow(a, b - 1)) % 1000000007;
}
