#include <fstream>

using namespace std;

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

int main()
{
    int n, i, k, v[16001], st=-1, dr=0,m,nr,s,sol;
    cin>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        if(v[i]>st) st=v[i];
        dr=dr+v[i];
    }
    while(st<=dr)
    {
        m=(st+dr)/2;
        s=0;
        nr=0;
        for(i=1;i<=n;i++)
        {
            s=s+v[i];
            if(s>m)
            {
                nr++;
                s=v[i];
            }
        }
        nr++;
        if(nr>k)
        {
            st=m+1;
        }
        else
        {
            sol=m;
            dr=m-1;
        }
    }
    cout<<sol;
    return 0;
}