#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int a[16001], n, k;
int st, dr=256000000, s, aux, mid;
int main()
{
    fin>>n>>k;
    for(int i=1; i<=n; i++)
    {
        fin>>a[i];
        if(a[i]>st)
            st=a[i];
    }
    while(st<=dr)
    {
        s=0;
        aux=1;
        mid=(st+dr)/2;
        for(int i=1; i<=n; i++)
            if (s+a[i]<=mid)
                s+=a[i];
            else
            {
                s=a[i];
                aux++;
            }
        if (aux>k)
            st=mid+1;
        else
            dr=mid-1;
    }
    fout<<st<<'\n';
    return 0;
}