Analysis of the Algorithm

We sequentially read and process numbers. We count the required number of numbers in the variable cnt. We calculate the sought sum in sum.

Implementation of the Algorithm

We read the number of numbers $n$.

scanf("%d", &n);

We count the number of required numbers and their sum in the variables cnt and sum.

cnt = sum = 0;

We sequentially read $n$ numbers.

for (i = 0; i < n; i++)
{
    scanf("%d", &a);
    
    if (a > 0 && a % 6 == 0)
    {
        cnt++;
        sum += a;
    }
}

We output the answer.

printf("%d %d\n", cnt, sum);