#include<cstdio>
int n,k,a[1>>16];
int transp(int capa)
{
	int q=0,nrcam=1;
	for(int i=1;i<=n;i++)
		if(q+a[i]<=capa)
		{
			q+=a[i];
		}
		else
		{
			nrcam++;
			q=a[i];
		}
	if(nrcam<=k)
		return 1;
	return 0;
}
int caut()
{
	int i,pas=(1<<29);
	for(i=0;pas;pas>>=1)
		if(transp(i+pas)==0)
			i+=pas;
	return i+1;
}
int main()
{
	freopen("transport.in","r",stdin);
	freopen("transport.out","w",stdout);
	scanf("%d%d",&n,&k);
	for(int i=1;i<=n;++i)
 		scanf("%d",&a[i]);
	printf("%d",caut());
	return 0;
}