#include<iostream>
#include<fstream>
using namespace std;
fstream fin("transport.in",ios::in),fout("transport.out",ios::out);
int x[16003],s=0,maxim=-9999,n,k;
bool verificare(int smax)
{
    int i,j,kk=0,saux;
    for(i=1;i<=n;i++)
    {
        saux=x[i];
        if(i+1>n)kk++;
        for(j=i+1;j<=n;j++)
        {
            saux+=x[j];
            if(saux>smax)
            {
                i=j-1;
                kk++;
                break;
            }
        }
    }
    if(kk>k)return 0;
    return 1;
}
int divide(int p,int u)
{
    int m,ultim;
    while(p<=u)
    {
        m=(p+u)/2;
        if(verificare(m))
        {
            ultim=m;
            u=m-1;
        }
        else
        {
            p=m+1;
        }
    }
    return ultim;
}
int main()
{
    int i;
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
        fin>>x[i];
        if(x[i]>maxim)maxim=x[i];
        s+=x[i];
    }
    fout<<divide(maxim,s);
    return 0;
}