#include <bits/stdc++.h>

using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int v[16005];
int main()
{
    int i, n, k, t, su=0, mx=INT_MIN, s, d, m, a, e, Cristii;
    f>>n>>k;
    for(i=1; i<=n; i++)
    {
        f>>v[i];
        if(v[i]>mx)
            mx=v[i];
        su+=v[i];
    }
    d=su;
    s=mx;
    m=(s+d)/2;
    while(s<=d)
    {
        a=1;
        e=0;
        m=(s+d)/2;
        for(i=1; i<=n; i++)
        {
            if(e+v[i]<=m)
            {
                e+=v[i];
            }
            else
            {
                e=v[i];
                a++;
            }
        }
        if(a>k)
        {
            s=m+1;
        }
        else
        {
            d=m-1;
        }
        Cristii=s;
    }
    g<<Cristii;
    return 0;
}