#include <iostream>
#include <fstream>
using namespace std;
int v[16001];
int main()
{
    int s,max,nrt,mijl,st,dr,i,n,k,rez;
    ifstream in("transport.in");
    ofstream out("transport.out");
    in>>n>>k;
    s=0;
    max=0;
    for(i=1;i<=n;i++)
    {
        in>>v[i];
        s=s+v[i];
        if(v[i]>max)max=v[i];
    }
    st=max;
    dr=s;
    while(st<=dr)
    {
        mijl=(st+dr)/2;
        s=0;
        nrt=1;
        for(i=1;i<=n;i++)
            if(s+v[i]<=mijl)s=s+v[i];
        else{nrt++;
        s=v[i];}
        if(nrt>k)st=mijl+1;
        else {rez=mijl;
        dr=mijl-1;}
    }
    out<<v[rez];
    return 0;
}