#include <fstream>

using namespace std;
int k,n,v[16005],S=0;
bool ok(int med)
{
    int sc,nrtr;
    sc=nrtr=0;
    for(int i=1;i<=n;i++)
    {
        if(v[i]>med)
            return 0;
        if(sc+v[i]<=med)
            sc=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()
{
        ifstream enter("transport.in");
        ofstream ret("transport.out");
        enter>>n>>k;
        for(int i=1;i<=n;i++)
        {
            enter>>v[i];
            S+=v[i];
        }
        ret<<bsL(1,S);
    return 0;
}