#include <fstream>

using namespace std;

ifstream in("transport.in");
ofstream out("transport.out");
int n,k,v[16001];
int verificare(int x)
{
    int s=0,a=0;
    for(int i=1; i<=n; i++)
    {
        if(s+v[i]>x)
        {
            a++;
            s=v[i];
        }
        else
            s+=v[i];

    }
    if(a>=k)
        return 1;
    else
        return 0;
}
int main()
{
    int i,s=0,a;
    in>>n>>k;
    for(i=1; i<=n; i++)
    {
        in>>v[i];
        s=s+v[i];
    }
    for(a=1; a<=s; a=a*2)
    {
    }
    int sol=s;
    for(int step=a; step>0; step/=2)
    {
        if(sol-step>0 && verificare(sol-step)==0)
            sol-=step;
    }
    out<<sol;
    return 0;
}