#include <iostream>
#include <fstream>

using namespace std;

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

int n,v[1000],k,i;

bool sepoate (int c)
{
//verifica daca cel mult k transporturi efectuate cu un
//camion de capcacitate c pot incarca toate saltelele
    int cc=c,nr=1;
    for(i=0; i<n; i++)
    {
        if(v[i]>c)return false;
        if(v[i]>cc)
        {
            nr++;
            cc=c;
        }
        cc-=v[i];
        if(nr>c)return false;
    }
    return true;
}

int main()
{

    in>>n>>k;
    for(i=0; i<n; i++)in>>v[i];
    int pas=1LL<<27,r=0;
    while(pas!=0)
    {
        if(!sepoate(r+pas))r+=pas;
        pas/=2;
        }

    r++;
    cout<<r;

    return 0;
}