#include <fstream>

using namespace std;
int const NMAX=16000;
int v[NMAX+5];
ifstream cin("transport.in");
ofstream cout("transport.out");
int main()
{
    int n,k,i,total=0,st,dr,med,last,tr;
    cin>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        total+=v[i];
    }
    st=1;
    dr=total;
    last=0;
    while(st<=dr)
    {
        med=(st+dr)/2;
        ///Calculam cate transpoturi sunt
        ///necesare pt a transporta toate saltelele
        tr=0;int sum=0;
        for(i=1;i<=n;i++)
        {
            if(v[i]>med)
            {
                tr=k+1;
                break;
            }
            if(sum+v[i]<=med)
            {
                sum+=v[i];
            }
            else
            {
                tr++;
                sum=v[i];
            }
        }
        if(sum<=med)
        tr++;
        if(tr<=k)
        {
            last=med;
            dr=med-1;
        }
        else st=med+1;
    }
    cout<<last;
    cin.close();
    cout.close();
    return 0;
}