#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,i,v[16001],st,dr,s,capa,m,x;
int main()
{
    f>>n>>k;
    for(i=1;i<=n;i++)
    {
        f>>v[i];
        dr=dr+v[i];
        if(v[i]>st)
            st=v[i];
    }
    dr++;
    while(st<=dr)
    {
        m=(st+dr)/2;
        x=0;
        for(i=0;i<=n;){
        x++;s=0;
        while(s+v[i+1]<=m)
        s=s+v[++i];
        }
        if(x<=k)
        {
            capa=m;
            dr=m-1;
        }
        else
        {
            st++;
        }

    }
    g<<capa;
    return 0;
}