#include <bits/stdc++.h>

using namespace std;

int n,a[16005],k,s;
ifstream fin("transport.in");
ofstream fout("transport.out");

int Ok(int D)
{
    int nr,s,i;
    nr=1;s=0;
    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 0;
    return 1;
}

void CautBin()
{
    int st,dr,D,sol;
    st=1;dr=sol=s;
    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];

    for(i=1;i<=n;i++)
        s+=a[i];
    CautBin();
    return 0;
}