#include <fstream>

using namespace std;
int v[16005],n,k,i,s,gr,maxx;
ifstream in("transport.in");
ofstream out("transport.out");
void citire()
{
    in>>n>>k;
    for(i=1; i<=n; i++)
    {
        in>>v[i];
        if(maxx<v[i])
            maxx=v[i];
    }

}
void prelucrare()
{
    for(i=1; i<=n; i++)
    {
        if(s+v[i]<=maxx)
            s=s+v[i];
        else
        {
            s=v[i];
            gr++;
        }
    }
    gr++;
    while(gr>k)
    {
        maxx++;
        s=0;
        gr=0;
        for(i=1; i<=n; i++)
        {
            if(s+v[i]<=maxx)
                s=s+v[i];
            else
            {
                s=v[i];
                gr++;
            }
        }
        gr++;
    }
}
void printare()
{
    out<<maxx;
}
int main()
{
    citire();
    prelucrare();
    printare();

    return 0;
}