#include <fstream>

using namespace std;

ifstream cin("transport.in");
ofstream cout("transport.out");

int v[16001],n,k;

bool ok(int med)
{
    int i,sc=0,nrtr=0;
    for(i=1;i<=n;i++)
    {
        if(v[i]>med)
            return 0;
        if(sc+v[i]<=med)
            sc+=v[i];
        else
        {
            nrtr++;
            sc=v[i];
        }
    }
    nrtr++;
    return (nrtr<=k);
}

int bsL(int st,int dr)
{
    int med,last;
    while(st<=dr)
    {
        med=(st+dr)/2;
        if(ok(med))
        {
            last=med;
            dr=med-1;
        }
        else st=med+1;
    }
    return last;
}

int main()
{
    int s=0;
    cin>>n>>k;
    for(int i=1;i<=n;i++)
        {
            cin>>v[i];
            s+=v[i];
        }
    cout<<bsL(1,s);
    return 0;
}