int f(int* pnBuffer, int nSize, int nIndex)
{
int nSum = 0;
for(int i = 0; i < nSize; i++)
{
if(i == nIndex)
{
nSum += pnBuffer[i];
nSum += pnBuffer[nSize - i - 1];
nIndex *= nIndex;
}
}
return nSum;
}