func_code_string: #include <bits/stdc++.h>   using namespace std;   string sd(int n) {     string s;     stringstream ss;     ss << n;     ss >> s;     return s;   }   int main() {     long long int n, k, a[105], c = 0, san = 0;     string s;     cin >> n >> k;     for (int i = 1; i <= n; i++) {       cin >> a[i];       s = sd(a[i]);       if (s.size() <= k) {         c++;       } else {         for (int j = 0; j < s.size(); j++) {           if (s[j] ==  4  or s[j] ==  7 ) san++;         }         if (san <= k) c++;       }       san = 0;     }     cout << c;     return 0;   }   