#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int a[16005],n,k,sum,maxx;
void citire()
{
    f>>n>>k;
    for(int i=1;i<=n;i++)
    {
        f>>a[i];
    sum+=a[i];maxx=max(maxx,a[i]);
    }
}

int solve(int m)
{
    int av=0,cont=1;
    for(int i=1;i<=n;i++)
    {
        if(a[i]+av<=m)
        {
        av+=a[i];
        }
        else {cont ++; av=a[i];}

   // cout<<a[i]<<" "<<cont<<"\n";
    }

    if(cont<k) return 1;
    if(cont==k) return 2;
    if(cont>k) return 3;
}

void binara()
{
    int aux,o,li=maxx,lf=sum;
    while(li<lf)
    {
        aux=(li+lf)/2;
       // cout<<aux<<"\n";
        o=solve(aux);
        if(o==2) {break;}
        if(o==1) {lf=aux;}
        if(o==3) {li=aux;}


    }
    int sol=aux;

    for(int i=aux-1;i>=maxx;i--)
    {
        //cout<<i<<"\n";
        o=solve(i);

      //  cout<<"\n";

        if(o==2) {sol=i;} else break;
    }
    g<<sol;


}
int main()
{
    citire();
    binara();




    return 0;
}