help me plzzzzzzzzzzz :(( c++ ạ.

#include<bits/stdc++.h>
using namespace std;
int ktsd (long long k) {
while (k>0) {
if (k%10 !=6 && k%10!=8)
return 0;
k=k/10;
}
return 1;
} int main() {
#define taskname "Bail"
if (fopen(taskname".inp", "r")) { freopen (taskname".inp", "r", stdin);
freopen (taskname". out", "w", stdout);
}
long long n,i,d, j;
cin>>n;
d=0;
for (i=1;i<=n;i++)
if (ktsd (i)==1)
d++;
cout<<d;
return 0;
}

_____________________________________________________________

@kieu

//Xin Hay Nhất

#include <bits/stdc++.h>
#define ll long long
#define nhanh  ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

using namespace std;
bool check_nice_number(ll n){
    while (!n==0){
        if (!(((n%10)==6) or ((n%10)==8)) ) return false ;
        n /= 10 ;
    }
    return true ;
    
}
int main(){
    nhanh ;
    ll n ; cin >> n ;
    ll d = 2 ;
    for (ll i=n;i>10;i--) if (check_nice_number(i)) d ++ ;
    cout << d ;
}