#include <fstream>
#include <climits>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,maxim,s,st,dr,v[16001],mij,k,sol;

int main()
{
    fin>>n>>k;
    maxim=INT_MIN;
    for(int i=1;i<=n;i++)
    {
        fin>>v[i];
        s+=v[i];
        if(v[i]>maxim)
            maxim=v[i];
    }
    st=maxim;
    dr=s;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        int nr=1;
        s=0;
        for(int i=1;i<=n;i++)
        {
            if(s+v[i]<=mij)
                s+=v[i];
            else
            {
                nr++;
                s=v[i];
            }
        }
        if(nr<=k)
        {
            sol=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    fout<<sol;
    return 0;
}