#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,m,j,i,mid,st,dr,cmax,nr,sol,k,s,sm;
int v[16004];
int main()
{
    fin>>n>>k;sm=0;cmax=0;

    for(i=1;i<=n;i++)
        {
            fin>>v[i];

            if(v[i]>cmax)
                cmax=v[i];

            sm=sm+v[i];
        }

    st=cmax;dr=sm;

    while(st<=dr)
    {
        mid=(st+dr)/2;
        s=v[1];nr=1;

        for(j=2;j<=n;j++)
            if(s+v[j]<=mid)
              s=s+v[j];
        else
        {
            s=v[j];
            nr++;
        }

        if(nr<=k)
        {
            sol=mid;
            dr=mid-1;
        }
        else

        st=mid+1;

    }

    fout<<sol;

    return 0;
}