#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16001];
int main()
{
    int i,n,k,c,s,ans,vmax=0;
    long long p=0;
    int st,dr,med;
    fin>>n>>k;
    for (i=1; i<=n; i++)
    {
        fin>>v[i];
        if(v[i]>vmax)
            vmax=v[i];
        p=p+v[i];
    }
    st=vmax;
    dr=p;
    while (st<=dr)
    {
        med=(st+dr)/2;
            c=0;
            s=0;
            for (i=1; i<=n; i++)
            {
                s=s+v[i];
                if(s+v[i+1]>med)
                {
                    c++;
                    s=0;
                }
            }
        c++;
        if(c<=k)
        {
            dr=med-1;
            ans=med;
        }
        else
            st=med+1;
    }
    fout<<ans;
    return 0;
}