#include<cstdio>
using namespace std;
int v[1601];
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,k,i,max1=0,s=0,l1,l2,pp=0,mid,c;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        if(max1<v[i])
            max1=v[i];
        s+=v[i];
    }
    l1=max1;
    l2=s;
    s=0;
    while(l2>=l1&&pp==0)
    {
        mid=(l1+l2)/2;
        c=0;
        s=v[1];
        for(i=2;i<=n;i++)
        {
            s+=v[i];
            if(s>mid)
            {
                s=v[i];
                c++;
            }
        }
        if(c<k)
            l2=mid-1;
        else
            l1=mid+1;
    }
    printf("%d",mid);
    return 0;
}