#include <iostream>
#include <cstdio>

using namespace std;

int v[16003];

int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,k,i,sum=0,max1=-1,st,dr,mij,sumax=0,h,rasp=2147483647;
    cin>>n>>k;
    for(i=1; i<=n; i++)
    {
        cin>>v[i];
        sum=sum+v[i];
        max1=max(max1,v[i]);
    }
    st=max1;
    dr=sum;
    while(dr>=st)
    {
        mij=(st+dr)/2;
        sumax=0;
        h=1;
        for(i=1; i<=n; i++)
        {
            if(sumax+v[i]<=mij)
                sumax=sumax+v[i];
            else
            {
                h++;
                sumax=v[i];
            }
        }
        if(h<=k)
        {
            rasp=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    cout<<rasp;
    return 0;
}