#include <fstream>
#include <cmath>
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int v[16001],v2[256000001];
int main()
{
    int n,k,i,j,st=1,dr,s=0,maxx=-1,m,ctr,sum,drum=1,sol;
    in>>n>>k;
    for(i=1; i<=n; i++)
    {
        in>>v[i];
        maxx=max(maxx,v[i]);
        s+=v[i];
    }
    for(i=maxx,j=1; i<=s; i++,j++)
        v2[j]=i;
    dr=s-maxx+1;
    while(st<=dr)
    {
        m=(st+dr)/2;
        ctr=v2[m];
        sum=0,drum=1;
        for(i=1; i<=n; i++)
        {
            if(v[i]+sum>ctr)
            {
                drum++;
                sum=v[i];
            }
            else
                sum+=v[i];
        }
        if(drum>k)
            st=m+1;
        else
        {
            dr=m-1;
            sol=ctr;
        }
    }
    out<<sol;
    return 0;
}