func_code_string: #include <bits/stdc++.h>   using namespace std;   int dx[] = {0, 0, 1, -1, 1, -1, 1, -1};   int dy[] = {1, -1, 0, 0, -1, 1, 1, -1};   long long gcd(long long a, long long b) { return !b ? a : gcd(b, a % b); }   long long lcm(long long a, long long b) { return (a / gcd(a, b)) * b; }   long long power(long long a, long long b, long long ret = 1LL) {     while (b--) ret = (ret * a);     return ret;   }   char a[105];   int main() {     long long n, k;     cin >> n >> k;     int ans = 0;     for (int i = 1; i <= n; i++) {       int cnt = 0;       long long x;       cin >> x;       while (x > 0) {         if (x % 10 == 7 || x % 10 == 4) {           cnt++;         }         x /= 10;       }       if (cnt <= k) ans++;     }     cout << ans;   }   