func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, ans;   void boost() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);   }   int main() {     boost();     cin >> n;     for (int a = 0; a <= 1; a++) {       for (int b = 0; b <= 1; b++) {         for (int c = 0; c <= 1; c++) {           for (int d = 0; d <= 1; d++) {             for (int e = 0; e <= 1; e++) {               for (int first = 0; first <= 1; first++) {                 for (int g = 0; g <= 1; g++) {                   for (int h = 0; h <= 1; h++) {                     for (int i = 0; i <= 1; i++) {                       for (int j = 0; j <= 1; j++) {                         if (a == 1 || b == 1 || c == 1 || d == 1 || e == 1 ||                             first == 1 || g == 1 || h == 1 || i == 1 || j == 1) {                           if (a * 1000000000 + b * 100000000 + c * 10000000 +                                   d * 1000000 + e * 100000 + first * 10000 +                                   g * 1000 + h * 100 + i * 10 + j <=                               n) {                             ans++;                           }                         }                       }                     }                   }                 }               }             }           }         }       }     }     cout << ans;   }   