#include <stdio.h>

using namespace std;

int v[16001];

int main()

{

    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,k,st=0,dr,i,m,sc,ct,poz;
    scanf("%d %d",&n,&k);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        if(v[i]>st)
        {
            st=v[i];
        }
        v[i]+=v[i-1];
    }
    dr=v[n];
    while(st<=dr)
    {
        m=(st+dr)/2;
        sc=0;
        ct=0;
        for(i=1;i<=n;i++)
        {
            for(i=i;v[i]-sc<=m && i<=n;i++){}
            ct++;
            i--;
            sc=v[i];
        }
        if(ct>k)
        {
            st=m+1;
        }
        else
        {
            dr=m-1;
            poz=m;
        }
    }
    printf("%d",poz);

    return 0;
}