#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

ifstream fin("transport.in");
ofstream fout("transport.out");

const int NMAX=16000;

int n,saltele[NMAX+1],k;

bool grupare(int nr_transporturi,int max_g){
    int transport_sum=0;
    for(int i=1;i<=n;i++)
    {
        if(transport_sum+saltele[i]<=max_g)
            transport_sum+=saltele[i];
        else
        {
            nr_transporturi--;
            if(nr_transporturi==0)
                return false;
            transport_sum=saltele[i];
        }
    }
    return true;
}

void cautare(int max_nr,int sum, int &min_g){
    int l=max_nr,r=sum;
    int m;
    while(l<=r){
        m=(l+r)/2;
        if(grupare(k,m)==true){   
            min_g=m;
            r=m-1;
        }
        else
            l=m+1;
    }
}

int main()
{
    fin>>n>>k;
    int max_nr=0,sum=0,min_g=0;
    for(int i=1;i<=n;i++)
    {
        fin>>saltele[i];
        max_nr=max(max_nr,saltele[i]);
        sum+=saltele[i];
    }
    cautare(max_nr,sum,min_g);
    fout<<min_g;
    return 0;
}