int Xselect(int k)
{
     for (int i=0;i<=k;i++)
	 {
         int minIndex = i;
         int minValue = pole[i];
         for (int j=i+1;j<=N-1;j++)
		 {
             if (pole[j] < minValue)
			 {
                 minIndex = j;
                 minValue = pole[j];
			 }
		 }
         swap(i,minIndex);
	 }
     return pole[k];
}