#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
bool verif(int v[],int n,int nr,int c)
{
    int contor=1,i,s=0,ok=1;
    for (i=1;i<=n;i++)
    {
        if (v[i]>c)
        {
            ok=0;
            break;
        }
        else
        {
            s=s+v[i];
            if (s>c)
            {
                contor++;
                s=v[i];
            }
            if (contor>nr)
            {
                ok=0;
                break;
            }
        }
    }
    if (ok==1) return true;
    return false;
}
int main()
{
    int n,nr,i,v[16005],st=1,dr=512000000,mij;
    fin >> n >> nr;
    for (i=1;i<=n;i++)
    {
        fin >> v[i];
    }
    while (st<dr)
    {
        mij=(st+dr)/2;
        if (verif(v,n,nr,mij)==1) dr=mij;
        else st=mij+1;
    }
    while (verif(v,n,nr,st-1)==1)
    {
        st=st-1;
    }
    fout << st;
}