#include <iostream>
#include <cstdio>
using namespace std;
int v[16001];
int main()
{
    int n,k,st,dr,i,mij,s,t,elem;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    cin>>n>>k;
    st=0;
    dr=0;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        if(v[i]>st)st=v[i];
        dr=dr+v[i];
    }
    while(st<=dr)
    {
        mij=(st+dr)/2;
        s=0;
        t=1;
        for(i=1;i<=n;i++)
        {

            if(s+v[i]>mij)
            {
                t++;
                s=v[i];
            }
            else
                s+=v[i];
        }
        if(t>k)
            st=mij+1;
        else
        {
            dr=mij-1;
            elem=mij;
        }
    }
    cout<<elem;

    return 0;
}