#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16002];
int main()
{
    int n,k;
    int st=0,dr=0,sol=0;
    fin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        fin>>v[i];
        if(v[i]>st) st=v[i];
        dr+=v[i];
    }
    while(st<=dr)
    {
        int mid=(st+dr)/2,nr=1,curent=0;
        for(int i=1;i<=n;i++)
        {
            if(v[i]+curent>mid)
                {nr++;curent=0;}
            curent+=v[i];
        }
        if(nr<=k)
        {
            dr=mid-1;
            sol=mid;
        }
        else
            st=mid+1;
    }
    fout<<sol;
    return 0;
}