#include <bits/stdc++.h>
using namespace std;
long long int mod = 1e9 + 7;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  double vp, vd, t, w, d, diff, rv, time, cp;
  cin >> vp >> vd >> t >> w >> d;
  long long int count = 0;
  cp = t * vp;
  while (1) {
    if (vp > vd) {
      count = 0;
      break;
    }
    diff = cp;
    rv = abs(vp - vd);
    time = diff / rv;
    cp += time * vp;
    if (cp >= d)
      break;
    else {
      t = w + (cp / vd);
      cp += t * vp;
      count += 1;
    }
  }
  cout << count << "\n";
  return 0;
}
