#include <bits/stdc++.h>
using namespace std;
double vp, vd, f, t, c;
int num;
double sp, sd;
double spend;
double cost;
const double eps = 1e-10;
int main() {
  while (cin >> vp >> vd >> t >> f >> c) {
    num = 0;
    sp = t * vp;
    sd = 0.0;
    if (sp + eps > c) {
      cout << "0" << endl;
      continue;
    }
    if (vp > vd) {
      cout << "0" << endl;
      continue;
    }
    while (true) {
      cost = (sp - sd) / (vd - vp);
      sp += cost * vp;
      if (sp + eps < c) {
        num++;
        cost = sp / vd + f;
        sp += cost * vp;
        if (sp + eps > c) {
          break;
        }
      } else {
        break;
      }
    }
    cout << num << endl;
  }
  return 0;
}
