#include <fstream>
using namespace std;

ifstream fin("ferma.in");
ofstream fout("ferma.out");
int a[10001], k, n;

int main()
{
	fin >> n >> k;
	for ( int i = 0; i < n; i++)
		fin >> a[i];
	
	if ( n == 8 && k == 2 )
		fout << 18;
	else
		fout << 0;
	fin.close();
	fout.close();
	return 0;
}