int foo(int n)
{
    //mysterious code details
}

void main()
{
    print(bar(9999999999999));
}

int bar(int n)
{
    int sum = 0;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            for (int k = 0; k < n; k++)
            {
                for (int l = 0; l < n; l++)
                {
                    sum += foo(i) * foo(j) * foo(k) * foo(l);
                }
            }
        }
    }
    return sum;
}