#include<cstdio>
using namespace std;
int v[16001];
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,k,i,max=0,s=0,sum,l1,l2,m,nrtrans,elem;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        if(max<v[i])
            max=v[i];
        s=s+v[i];
    }
    l1=max;
    l2=s;
    while(l1<=l2)
    {
        m=(l1+l2)/2;
        nrtrans=1;
        sum=0;
        for(i=1;i<=n;i++)
        {
            if(sum+v[i]<=m)
                sum=sum+v[i];
            else
            {
                nrtrans++;
                sum=v[i];
            }
        }
        if(nrtrans>k)
        {
            l1=m+1;
        }
        else
        {
            l2=m-1;
            elem=m;
        }
    }
    printf("%d",elem);
    return 0;
}