#include <fstream>

using namespace std;

ifstream cin ("transport.in");
ofstream cout ("transport.out");

int main()
{
    int n,i,k,p,nr,s,gasit,m;
    long long u;
    cin>>n>>k;
    int v[n];
    for(i=1;i<=n;i++)
        cin>>v[i];
    p=1;
    u=16000*16000;
    gasit=0;
    while(p<u && gasit==0)
    {
        m=(u+p)/2;
        s=0;
        nr=0;
        for(i=1;i<=n;i++)
        {
            s=s+v[i];
            if(s>m)
            {
                nr++;
                s=v[i];
            }
        }
        if(nr==k) gasit=m;
        else
        {
            if(nr>k)
                p=m+1;
            else
                u=m-1;
        }
    }
    cout<<gasit;
    return 0;
}