func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     long long ans = 0;     long long a = 1, b = 2, c;     while (b <= n) {       ans++;       c = a + b;       a = b;       b = c;     }     cout << ans << endl;     return 0;   }   