#include <fstream>

using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,kk,st,sf,s,i,mid,v[16000],ma,mid1;
int main()
{
    f>>n>>k;
    ma=0;
    for(i=1; i<=n; i++)
    {
        f>>v[i];
        s=s+v[i];
        if(v[i]>ma)ma=v[i];
    }
    st=ma;
    sf=s;
    while(st<=sf)
    {
        mid=(st+sf)/2;
        s=0;
        kk=1;
        for(i=1; i<=n; i++)
        {
            if(v[i]+s<=mid)s=s+v[i];
            else
            {
                s=v[i];
                kk++;
            }
        }
        if(kk>k)
        {
            st=mid+1;
        }
        if(kk<=k)
        {mid1=mid;
            sf=mid-1;
        }

    }
    g<<mid1;
    return 0;
}