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

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

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

bool Verificare(int x)
{
    //verifica daca camionul cu capacitate x poate duce toate saltelele in k transporturi
    int suma=0;
    int t=0;
    for(int i=1; i<=n; i++)
    {
        if(suma+v[i]<=x)
            suma+=v[i];
        else
        {
            suma=v[i];
            t++;
            if(t>k)
                return 0;
        }
    }
    if(t+1>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=0;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(Verificare(mij))
            sol=mij, dr=mij-1;
        else
            st=mij+1;
    }
    fout<<sol;
    return 0;
}