func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long int n;     cin >> n;     long long int k;     cin >> k;     vector<long long int> arr(n, 0);     long long int cnt = 0;     for (int i = 0; i < n; ++i) {       cin >> arr[i];       long long int var = 0;       while (arr[i] > 0) {         long long int rem = arr[i] % 10;         if (rem == 4 || rem == 7) {           var++;         }         arr[i] /= 10;       }       if (var > k) {         cnt++;       }     }     cout << n - cnt <<   n ;     return 0;   }   