#include <cstdio>
#include  <iostream>

using namespace std;

int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,l1,l2,elem,m,t,s,i,maxim,v[16001],k;
    cin>>n>>k;
    l1=0;
    l2=0;
    for(i=0; i<=n; i++)
    {
        cin>>v[i];
        if(v[i]>l1)
            l1=v[i];
        l2=l2+v[i];
    }
    while(l1<=l2)
    {
        m=(l1+l2)/2;
        t=1;
        s=0;
        for(i=1; i<=n; i++)
            if(s+v[i]<m)
                s+=v[i];
            else
            {
                t++;
                s=v[i];
            }
        if(t>k)
            l1=m+1;
        else
        {
            l2=m-1;
            elem=m;
        }
    }
    cout<<elem;
    return 0;
}