#include<fstream>
#define nx 16007
using namespace std;
int n,sol,s,d,i,m,k,v[nx];

ifstream fin("transport.in");
ofstream fout("transport.out");

int verifica(int val)
{
    int s=0,nr=0;

    for(i=1;i<=n;i++)
    {
        s+=v[i];
        if(s>m)nr++,s=v[i];
    }
    if(s)nr++;

    if(nr>k)return 0;
    return 1;
}

int main()
{
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        if(v[i]>s)s=v[i];
        d+=v[i];
    }

    while(s<=d)
    {
        m=(s+d)/2;
        if(verifica(m))
        {
            if(m<sol || !sol)sol=m;
            d=m-1;
        }
        else s=m+1;
    }

    fout<<sol;
    return 0;
}