#include <bits/stdc++.h>

using namespace std;

ifstream fin("transport.in");
ofstream fout("transport.out");

#define cin fin
#define cout fout

const int Nmax=2e4;
int v[Nmax];

int main()
{
    int n,k;
    cin>>n>>k;
    int st=0,dr=0;
    for(int i=1;i<=n;i++)
    {
        cin>>v[i];
        dr+=v[i];
        st=max(st,v[i]);
    }
    int ans=0;
    while(st<=dr)
    {
        int m=(st+dr)/2;
        int nr=0,cnt=1,idx=0;
        for(int i=1;i<=n;i++)
        {
            if(nr+v[i]<=m)
            {
                nr+=v[i];
            }
            else
            {
                cnt++;
                nr=v[i];
            }
        }
        if(cnt>k)
        {
            st=m+1;
        }
        else
        {
            dr=m-1;
            ans=m;
        }
    }
    cout<<ans;
    return 0;
}