#include <bits/stdc++.h>
#define ll long long int
//"\n"
using namespace std;
string nume="transport";
ifstream fin(nume+".in");
ofstream fout(nume+".out");
ll n,l,v[16005],k;

int main()
{
    fin>>n>>k;
    for(ll i=1;i<=n;i++)
        fin>>v[i];
    ll  st=1,dr= 25600000,m,poz;
    while(st<=dr)
    {
        m=(st+dr)/2;
        ll s=0,cnt=1;
        for(ll i=1;i<=n;i++)
        {
            s+=v[i];
            if(s>m)
            {
                ++cnt;
                s=v[i];
            }
        }
        if(cnt<=k)
        {
            poz=m;
            dr=m-1;
        }
        else st=m+1;
    }
    fout<<poz;

}