#include<fstream>
using namespace std;
int a[18],s,c,b,i,j=1;
ifstream in("zebughil.in");
ofstream out("zebughil.out");
int main()
{
int n,g;
in>>n>>g;
for(i=1;i<=n;i++)
{	
	in>>b;
	s=s+b;
}
if(s%g==0)
c=s/g;
else
	c=s/g+1;
out<<c;

in.close();
out.close();
return 0;
}