#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16002];
int main()
{
    int n,k,halp;
    fin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        fin>>halp;
        v[i]=halp+v[i-1];
    }
    int st=1,dr=16000,sol;
    while(st<=dr)
    {
        int mid=(st+dr)/2,nr=1,curent=0;
        for(int i=1;i<=n;i++)
        {
            if(v[i]-v[i-1]>mid)
            {
                nr=9999999;
                break;
            }
            else
                if(mid-v[i]+curent<0)
                {
                    nr++;
                    curent=v[i-1];
                }
        }
        if(nr<=k)
        {
            dr=mid-1;
            sol=mid;
        }
        else
            st=mid+1;
    }
    fout<<sol;
    return 0;
}