#include <fstream>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int k,n,i,v[16001],d,s,mij,sum,vmax,kk,j;
int main()
{
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        if(v[i]>vmax)
        {
            vmax=v[i];
        }
        d=d+v[i];
    }
    s=vmax;
    while(1)
    {
        kk=0;
        sum=0;
        mij=(s+d)/2;
        for(i=1;i<=n;i++)
        {
            sum=sum+v[i];
            if(sum>mij)
            {
                kk++;
                sum=v[i];
            }
        }
        kk++;
        if(kk>k)
        {
            break;
        }
        j=mij;
        d=mij;
    }
    fout<<j;
    return 0;
}