#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int N,K,V[16005];
int sol;
int st=1,dr=16000,mid;
int isgood(int D)
{
    int S=0,nr=0;
    for(int i=1;i<=N;i++)
    {
        S+=V[i];
        if(S>D or i==N)
        {
            S=V[i];
            nr++;
        }

    }
    return nr;
}
int main()
{
    f>>N>>K;
    for(int i=1;i<=N;i++)
        f>>V[i];
    while(st<=dr)
    {
        mid=(st+dr)/2;
        if(isgood(mid)==K)
        {
            sol=mid;
            st=mid+1;
        }
        else
            dr=mid-1;
    }
    g<<sol;
}