What is the statement or expression at ?1?

void insertionSort(int array[])
{
    int n = ?1?;
    for (int j = 1; j < n; j++)
    {
        int key = ?2?;
        int i = j - 1;
        while ((i > -1) && (array[i] > ?3?))
        {
            array[i + 1] = ?4?;
            i--;
        }
        ?5? = key;
    }
}