#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int i,v[20000],n,k,j,a,maxi,mini=160000,ok,t,c;
int main()
{
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        maxi+=v[i];
        mini=max(mini,v[i]);
    }
    while(maxi!=mini)
    {
        a=maxi+mini;
        a/=2;
        t=0;
        c=a;int nrTrans;int aux;
       for( i = 1 , aux = 0 , nrTrans = 1 ; i <= n ; ++i )
        {
            if( aux + v[ i ] > a )
            {
                aux = v[ i ];
                ++nrTrans;
            }
            else
            {
                aux += v[ i ];
            }
        }t=nrTrans;

        if(t>k)
                mini=a+1;
        else
            maxi=a;
    }
    fout<<maxi;
    return 0;
}