#include <iostream>
#include<cstdio>
using namespace std;
int v[16001];
int main()
{
    int n,l1,l2,m,t,s,k,elem,i;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    cin>>n>>k;
    l1=0;
    l2=0;
    for(i=1; i<=n; i++)
    {
        cin>>v[i];
        if(l1<v[i])
            l1=v[i];
        l2=l2+v[i];
    }
    while(l1<=l2)
    {
        m=(l1+l2)/2;
        t=1;
        s=0;
        for(i=1; i<=n; i++)
            if(s+v[i]<=m)
                s=s+v[i];
            else
            {
                t++;
                s=v[i];
            }
        if(t>k)
            l1=m+1;
        else
        {
            elem=m;
            l2=m-1;
        }
    }
    cout<<elem;
    return 0;
}