#include <fstream>

using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
short int v[16001];
int main()
{
    int n, k, i, drm, mij, dr, st, mini=-1, sum=0, cc=0, x;
    cin>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        sum+=v[i];
        if(v[i]>mini)
            mini=v[i];
    }
    st=mini;
    dr=sum;
//    cout<<st<<endl<<dr;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        x=drm=0;
        i=1;
        while(i<=n)
        {
            x+=v[i];
            if(x>mij)
            {
                drm++;
                x=v[i];
            }
            i++;
        }
        drm++;
//        cout<<mij<<" "<<drm<<" ";
        if(drm>k)
            st=mij+1;
        else
        {
            dr=mij-1;
            cc=mij;
        }
//        cout<<cc<<endl;
    }
    cout<<cc;
    return 0;
}