1 #include <bits/stdc++.h>
 2 
 3 using namespace std;
 4 typedef long long LL;
 5 
 6 const int MAXN = 100000;
 7 int st, ed, ans = 0;
 8 
 9 void solv(int a, int b, int c) {
10     if(a == b && a == c && a == st) return ;
11     ans++;
12     if(ans % 3 == 1) st < b + c ? a = st : a = b + c - 1;//让第一条边尽可能接近 st
13     else if(ans % 3 == 2) st < a + c ? b = st : b = a + c - 1;
14     else st < a + b ? c = st : c = a + b - 1;
15     solv(a, b, c);
16 }
17 
18 int main() {
19     ios_base::sync_with_stdio(); cin.tie();
20     cin >> st >> ed;
21     solv(ed, ed, ed);
22     cout << ans << endl;
23     return 0;
24 }