学步园

//poj2209 好水啊 
#include <iostream>
#include <string>
#include <math.h>
using namespace std;
int CC[105];
int main()
{
	int n, a;
	cin>>n;
	cin>>a;
	int sum = 0;
	int total = 0;
	for(int i = 0; i < n; i++)
	{
		cin>>CC[i];
		if(CC[i] > 0)
			sum += pow(CC[i]*1.0, a);
		 total += pow(CC[i]*1.0, a);
	}	


	if(a % 2 == 0)
	{
		cout<<(int)total<<endl;	
	}
	else
	{
		cout<<(int)sum<<endl;
	}
	return 0;
}