#include <iostream>
#include <fstream>
using namespace std;
int v[16001];
int main()
{
    ifstream fin ("transport.in");
    ofstream fout ("transport.out");
    int n,k,i,max=0,st,dr,rest,p,t,mij,s=0;
    fin>>n>>k;
    for(i=1; i<=n; i++)
    {
        fin>>v[i];
        s+=v[i];
        if(v[i]>max)
            max=v[i];
    }
    st=max;
    dr=s;
    i=1;
    //cout<<st<<" "<<dr;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        rest=mij;
        i=1;
        t=0;
        while(i<=n)
        {
            rest=mij;
            while(v[i]<=rest)
            {
                rest-=v[i];
                i++;
            }
            t++;
        }
        if(t<k)
        {
            dr=mij-1;
        }
        else
        {
            st=mij+1;
            p=mij-1;
        }
        //cout<<mij<<" "<<t<<" "<<st<<"\n";
    }
    fout<<p;
    return 0;
}