#include<stdio.h>
#include<math.h>
int main()
{
    int n,p,i,a[101],min=-100000,flag=0;
    double sum=0;
    scanf("%d%d",&n,&p);
    for(i=0;i<n;i++)
      {
      scanf("%d",&a[i]);
      if(a[i]>=0)
        {
        sum+=pow((double)a[i],(double)p);
        flag=1;
        }
      else
        if(a[i]>min)
          min=a[i];
      }
    if(flag)
      printf("%d\n",(int)sum);
    else
      printf("%d\n",(int)pow((double)min,(double)p));
    return 0;    
}