#include <bits/stdc++.h>
using namespace std;

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

int n,k,maxim=0,suma=0;
int v[16005];

bool Verificare(int x)
{
    int s=0,t=0;
    for(int i=1;i<=n;i++)
    {
        if(s+v[i]>x)
        {
            s=v[i];
            t++;
            if(t>k)
                return 0;
        }
        else
            s+=v[i];
    }
    if(t>=k)
        return 0;
    return 1;
}

int main()
{
    fin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        fin>>v[i];
        maxim=max(maxim,v[i]);
        suma+=v[i];
    }
    int st=maxim,dr=suma,sol=-1;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(Verificare(mij))
        {
            sol=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    fout<<st;
    return 0;
}