#include <fstream>

using namespace std;
ifstream in ("transport.in");
ofstream out ("transport.out");
const int N=16002;
int v[N],n,k;

int verif(int l)
{
    int i,s=0,cnt=1;
    for (i=1;i<n;i++)
    {
        s+=v[i];
        if (l<s+v[i+1])
            cnt++, s=0;
    }
    if (cnt>k)
        return 0;
    return 1;
}
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;
    return 0;
}