#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16001];
int main()
{
    int i,nr,maxi=0,s=0,st,dr,mij;
    fin>>n>>k;
    for(i=1; i<=n; i++)
    {
        fin>>v[i];
        if(v[i]>maxi)
            maxi=v[i];
        s=s+v[i];
    }
    st=maxi;
    dr=s;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        nr=0;
        i=1;
        while(i<=n)
        {
            s=0;
            while(s+v[i]<=mij)
            {
                s+=v[i];
                i++;
            }
            nr++;
        }
        if(nr<=k)
            dr=mij-1;
        else
            st=mij+1;
    }
    fout<<st;
    return 0;
}