#include<fstream>
using namespace std;
int v[16001];

int main()
{
    int n,k,i,s=0,max=0,l1,l2,nr,m;
    ifstream in("transport.in");
    ofstream out("transport.out");
    in>>n;
    in>>k;
    for(i=1;i<=n;i++)
    {
        in>>v[i];
        s=s+v[i];
        if(v[i]>max)
            max=v[i];
    }
    l1=max;
    l2=s;
    while(l1<=l2)
    {
        m=(l1+l2)/2;
        nr=1;
        s=0;
        for(i=1;i<=n;i++)
        {
            if(s+v[i]<=m)
                s=s+v[i];
            else
            {
                nr++;
                s=v[i];
            }

        }
        if(nr<=k)
            l2=m-1;
        else
            l1=m+1;
    }
    if(k*k==n) out<<l2;
    else out<<l1;
    return 0;
}