#include <fstream>

using namespace std;

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

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