#include <fstream>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16001];
int main()
{
    int n,k,i,sumt=0;
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        sumt+=v[i];
    }
    int st,dr,med,last=0,s=0,nr=0;
    st=1; dr=sumt;
    while(st<=dr)
    {
        med=(st+dr)/2;
        nr=0;
        s=0;
        for(i=1;i<=n;i++)
        {
            if(v[i]>med)
            {
                nr=k+1;
                break;
            }
            if(s+v[i]<=med)
            {
                s+=v[i];
            }
            else{
                s=v[i];
                nr++;
            }
        }
        if(s<=med)
            nr++;
        if(nr>k)
        {
            st=med+1;
        }
        else{
            dr=med-1;
            last=med;
        }
    }
    fout<<last;
    return 0;
}