#include <fstream>
using namespace std;
ifstream in ("transport.in");
ofstream out ("transport.out");
int v[16005];
int main()
{
    int n,i,k,s,st,dr,mij,maxv,cnt,sum,sol;
    in>>n>>k;
    s=0;maxv=-1;
    for(i=1;i<=n;++i)
    {
        in>>v[i];
        if(v[i]>maxv)
            maxv=v[i];
        s=s+v[i];
    }
    st=maxv;dr=s;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        cnt=0;sum=0;
        for (i=1;i<=n && cnt<=k;++i)
        {
            if(sum+v[i]>mij)
            {
                cnt++;
                sum=0;
            }
            sum=sum+v[i];
        }
        cnt++;
        if (cnt>k)
            st=mij+1;
        else
        {
            sol=mij;
            dr=mij-1;
        }
        sum=0;
    }
    out<<sol;
    return 0;
}