#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    int n,k,v[16000],max_saltea=0,suma_vol=0,i,mid,s,ki;
    ifstream f ("transport.in");
    ofstream g("transport.out");
    f>>n>>k;
    for(i=0;i<n;i++)
     { f>>v[i];
       if(v[i]>max_saltea)
         max_saltea=v[i];
       suma_vol=suma_vol+v[i];}
    do
    {
        mid=(max_saltea+suma_vol)/2;
        s=0;
        ki=1;
        for(i=0;i<n;i++)
        {
            s=s+v[i];
            if(s>mid){ki++;
            s=v[i];}
        }
        if(ki>k)
            max_saltea=mid+1;
         else
            suma_vol=mid;
    }while(max_saltea<suma_vol);
    g<<suma_vol;
    return 0;
}