#include <iostream>
#include <fstream>

using namespace std;

int n,k,a[16005],z,x[16005],s;

int main()
{
    int i,j,q,w,e,mn,mx;
    FILE *f=fopen("transport.in","r");
    FILE *g=fopen("transport.out","w");
    fscanf(f,"%d %d",&n,&k);
    for(i=1;i<=n;i++)
    {
        fscanf(f,"%d",&x[i]);
        s+=x[i];
    }
    s/=k;
    a[1]=x[1];
    int in=1;
    for(i=2;i<=n;i++)
    {
        if(a[in]+x[i]<s)
            a[in]+=x[i];
        else
        {
            if(in<k)
                in++,a[in]+=x[i];
            else a[in]+=x[i];
        }
    }
    mx=0;
    for(i=1;i<=k;i++)
        mx=max(mx,a[i]);
    fprintf(g,"%d\n",mx);
    return 0;
}