#include <fstream>

#define DIM 16003
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");

int v[DIM];

int main()
{
    int n,k,Max,s;
    fin>>n>>k;
    s=0;
    Max=0;
    for(int i=1; i<=n;i++)
    {
        fin>>v[i];
        if(v[i]>Max)
            Max=v[i];
        s=s+v[i];
    }
    /// caut binar capacitatea camionului pe intervalul [Max, s]
    int st=Max;
    int dr=s;
    int sol=0;
    while(st<=dr) {
        int mid = (st+dr)/2;
        ///am fixat capacitatea in mid, determin cate transporturi fac
        int nr=1, sum=0;
        for(int i=1;i<=n;i++){
            if(sum + v[i] <= mid)
                sum=sum+v[i];
            else
            {
                nr++;
                sum=v[i];
            }

        }
        if(nr<=k)
        {
            sol=mid;
            dr=mid-1;
        }
        else
            st=mid+1;
    }
    fout<<sol;
    return 0;
}