#include <fstream>
#define MAX 16000*16000 ///pt k=1, n=16000, toate volumele=16000
using namespace std;
ifstream fi("transport.in");
ofstream fo("transport.out");

int n,k,x[16001],i,j,st,dr,mij;

int ok(int cap)
{
    ///e ok capacitatea cap
    int curent=0,transporturi=1;
    for (int i=1; i<=n; i++)
    {
        if (curent+x[i]<=cap)
            curent+=x[i];
        else
        {
            if (x[i]>cap)
                return 0;
            curent=x[i];
            transporturi++;
        }
    }
    return transporturi<=k;
}

int main()
{
    fi>>n>>k;
    for (i=1; i<=n; i++)
        fi>>x[i];
    ///cautam binar minimul necesar de la 1 la MAX
    st=0,dr=MAX;
    while (dr-st>1)
    {
        mij=(st+dr)/2;
        if (!ok(mij))
            st=mij;
        else
            dr=mij;
    }
    ///rezultatul = dr
    while (ok(dr-1))
        dr--;
    fo<<dr;
    fi.close();
    fo.close();
    return 0;
}