#include <iostream>
#include <fstream>
using namespace std;
int v[16005],x,i,st,dr,m,k,o,n,mx,s,sol;
ifstream in("transport.in");
ofstream out("transport.out");
bool verif(int m, int v[])
{
    x=m;o=1;
    for (i=1;i<=n;i++)
    {
        if (v[i]>x) {o++;x=m;}
        x-=v[i];
        if (o>k) return 0;
    }
    if (o>k) return 0;
    else return m;
}
int main()
{
    in>>n>>k;
    for (i=1;i<=n;i++)
    {
        in>>v[i];
        if (v[i]>mx) mx=v[i];
        s+=v[i];
    }
    st=mx;dr=s;
    while (st<=dr)
    {
        m=(st+dr)/2;
        int y=verif(m,v);
        if (y) {sol=m;dr=m-1;}
        else st=m+1;
    }
    out<<sol;
}