#include <bits/stdc++.h>
using namespace std;
int main() {
  float vp, vd, t, f, c, x;
  cin >> vp >> vd >> t >> f >> c;
  int count = 0;
  if (vp < vd) {
    x = (vp * t * vd) / (vd - vp);
    if (x < c) count = 1;
    while (x < c) {
      x = x + (f + (x / vd)) * vp;
      if (x >= c) {
        break;
      } else {
        x = (x * vd) / (vd - vp);
        if (x < c)
          count++;
        else
          break;
      }
    }
  } else {
    count = 0;
  }
  cout << count << endl;
}
