#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int n, m, k, x, y, i, j, count = 0;
  long double sp = 0, tim, sd, vp, vd, f, c, t;
  cin >> vp >> vd >> t >> f >> c;
  if (vp >= vd) {
    cout << 0;
  } else {
    sp = vp * t;
    sd = 0;
    while (sp < c) {
      t += sp / (vd - vp);
      sp = sd = vp * t;
      if (sp >= c) {
        break;
      } else {
        count++;
        sp += vp * (sd / vd + f);
        t += sd / vd + f;
        sd = 0;
      }
    }
    cout << count;
  }
  return 0;
}
