#include <fstream>
using namespace std;
ifstream in ("transport.in");
ofstream out ("transport.out");
const int N=16002;
int v[N],n,k;
bool verif(int l)
{   int i,s=0,cnt=0;
    for (i=1;i<=n;i++)
    {   if (v[i]>s) cnt++, s=l;
        if (v[i]>s) return false;
        if (cnt>k) return false;
        s-=v[i];
    }
    return true;
}
int main()
{   int i,r=0,pas=1<<30;
    in>>n>>k;
    for (i=1;i<=n;i++) in>>v[i];
    while (pas)
    {   if (verif(r+pas)==0) r+=pas;
        pas/=2;
    }
    out<<r+1;
    out.close(); return 0;
}