#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int gr[16001],n,k,ls,ld,mij;
int verif(int x)
{
    int s=0,kk=1;
    for(int i=1;i<=n;i++)
    {
        if(s+gr[i]>x)
            {
                s=gr[i];
                kk++;
            }
        else s+=gr[i];
    }
    if(kk<=k)return 1;
    return 0;
}
int main()
{
    fin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        fin>>gr[i];
        ld+=gr[i];
        if(gr[i]>ls)ls=gr[i];
    }
    while(ls<ld)
    {
        mij=(ls+ld)/2;
        if(verif(mij))ld=mij;
        else ls=mij+1;
    }
    fout<<ld;
    return 0;
}