#include <bits/stdc++.h>
using namespace std;
int num[1 << 18];
char str[20];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  ;
  int x, y;
  cin >> x >> y;
  int a, b, c, ans = 0;
  a = b = c = y;
  while (a < x) {
    swap(a, b);
    swap(b, c);
    c = a + b - 1;
    ans++;
  }
  cout << ans << endl;
  return 0;
}
