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