#include <bits/stdc++.h>
int main() {
  double n, m, i, j, k, l, a, b;
  int sum;
  while (~scanf("%lf %lf %lf %lf %lf", &n, &m, &k, &l, &a)) {
    sum = 0;
    if (n >= m)
      printf("0\n");
    else {
      b = m * n * k / (m - n);
      sum++;
      while (b < a) {
        b = (((b / m + l) * n + b) / (m - n)) * m;
        sum++;
      }
      printf("%d\n", sum - 1);
    }
  }
}
