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