#include <fstream>

using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int v[160001];
int main()
{
    int n,i,c=0,s,k,zile,cnt,stot=0,strue=0,ok=0,max=0;
    in>>n>>k;
    for(i=1; i<=n; i++)
    {
        in>>v[i];
        strue+=v[i];
        if(max<=v[i])
            max=v[i];
    }
    c=max;
    while(true)
    {
        ok=0;
        stot=0;
        c++;
        for(i=1,cnt=0; i<=n; cnt++)
        {
            s=0;
            while(s<=c)
            {
                if(s+v[i]<=c&&i<=n)
                {
                    s+=v[i];
                    i++;
                }
                else
                    break;
            }
            stot+=s;

        }
        if(stot==strue&&cnt<=k)
        {
            out<<c;
            break;
        }
    }
    return 0;
}