#include<iostream>
#include<cstdio>
using namespace std;
const int maxn=100005;
int n,k,a[maxn],sum,d,l=maxn,r=0,mid,minn=maxn,i;
int Main()
{
	freopen("seqa.in","r",stdin);freopen("seqa.out","w",stdout);
	scanf("%d%d",&n,&k);
	for(i=1;i<=n;i++)
	{
		scanf("%d",&a[i]);
		if(l>a[i])l=a[i];
		r+=a[i];
	}
	while(l<=r)
	{
		sum=0;
		d=1;
		mid=(l+r)/2;
		for(i=1;i<=n;i++)
		{
			sum+=a[i];
			if(sum>mid)
			{
				sum=a[i];
				d++;
			}
		}
		if(d<=k)r=mid-1;
		if(d>k)l=mid+1;
	}
	printf("%d",l);
	return 0;
}
int main(){;}
int syy=Main();