#include <iostream>
#include <fstream>
using namespace std;
int v[20000];
int main()
{
    ifstream cin("transport.in");
    ofstream cout("transport.out");
    int n,k,s=0,c,nrc=0,suma=0,ma=0;
    cin>>n>>k;
    for(int i=1; i<=n; i++)
    {
        cin>>v[i];
    suma=suma+v[i];
    if(v[i]>ma)
    ma=v[i];
    }
    int st=ma,dr=suma;
    while(dr>st)
    {
        nrc=0;
        c=(st+dr)/2;
        s=0;
        for(int i=1; i<=n; i++)
        {
            if(v[i]+s<=c)
            {
                s=s+v[i];
            }
            else
            {
                s=v[i];
                nrc++;
            }

        }
        if(nrc<k)
        {
            dr=c-1;
        }
        else
        {
            st=c+1;
        }
    }
    cout<<st;
    return 0;
}