# include <fstream>
using namespace std;
# define DIM 16001
ifstream in("transport.in");
ofstream out("transport.out");
int x[DIM];
int main()
{
    int n,m,i,p,u,mij,k,maxi=0,s=0,nr,r;
    in>>n>>k;
    for (i=1;i<=n;i++)
    {
        in>>x[i];
        if (x[i]>maxi) maxi=x[i];
        s+=x[i];
    }
    p=maxi;
    u=s;
    while (p<=u)
    {
        mij=(p+u)/2;
        m=0;
        nr=1;
        for (i=1;i<=n;i++)
        {
            m+=x[i];
            if (m>mij)
            {
                nr++;
                m=x[i];
            }
        }
        if (nr<=k)
        {
            u=mij-1;
            r=mij;
        }
        else
        {
            p=mij+1;
            r=mij+1;
        }
    }
    out<<r;
    return 0;
}