#include <bits/stdc++.h>

using namespace std;
ifstream fin ("transport.in");
ofstream fout ("transport.out");
int n,k,suma;

int a[16005];

int ok (int d)
{
    int s,nr,i;
    s=0;nr=1;
    for(i=1;i<=n;i++)
    {
        if(a[i]>d) return 0;
        if(s+a[i]<=d) s+=a[i];
        else
            {
                nr++;
                s=a[i];
            }
    }
    if(nr<=k) return 1;
    else return 0;
}

void CautBin()
{
    int st ,dr, d, sol;
    st=1;dr=suma;sol=suma;
    while(st<=dr)
    {
        d=(st+dr)/2;
        if(ok(d)==1)
        {
            sol=d;
            dr=d-1;
        }
        else st=d+1;
    }
    fout<<sol;
}
int main()
{
    int i;
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
         fin>>a[i]; suma+=a[i];
    }
    CautBin();
    fin.close();
    fout.close();
    return 0;
}