#include <stdio.h>
#define N 16000
int n,k,v[N],vmax,s;
void read()
{
	scanf("%d%d",&n,&k);
	int i;
	for (i=1; i<=n; i++)
	{
		scanf("%d",&v[i]);
		s+=v[i];
		if (v[i]>vmax)
			vmax=v[i];
	}
}
int rezolva(int m)
{
	int i,op=0,sact=0;
	for (i=1; i<=n; i++)
	{
		if (sact+v[i]<=m)
			sact+=v[i];
		else
		{
			op++;
			sact=0;
		}
	}
	return op+1;
}
int cbin()
{
	int st=vmax,dr=s,m,rez;
	while (st!=dr)
	{
		m=(st+dr)/2;
		rez=rezolva(m);
		if (rez<=k)
			dr=m;
		else
			st=m+1;
	}
	if (rezolva(st)<=k)
		return st;
	return st-1;
}
int main()
{
	freopen("transport.in","r",stdin);
	freopen("transport.out","w",stdout);
	read();
	//printf("%d",rezolva(10));
	printf("%d\n",cbin());
	return 0;
}