#include <cstdio>

using namespace std;

int n,k,v[1<<15];

int tr(int x) 
{
	int cnt=0,sum=0;
	for (int i=1;i<=n;++i) 
	{
		if (sum+v[i]>x) 
		{
			++cnt;
			sum=v[i];
			continue;
		}
		sum+=v[i];
	}
	if (sum) 
		++cnt;
	return cnt;
}

int bs() 
{
	int i,step=1<<30;
	for (i=0;step;step>>=1) 
		if (tr(i+step)>k) 
			i+=step;
	return i+1;
}
void citire() 
{
	freopen("transport.in","r",stdin);
	freopen("transport.out","w",stdout);
	scanf("%d%d",&n,&k);
	for(int	i=1;i<=n;scanf("%d",&v[i++]));
}
void afisare() 
{
	printf("%d",bs());
}

int main() 
{
	citire ();
	afisare ();
	return 0;
}