#include <fstream>

using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int v[16005],n,k;
bool se_poate(int c)
{
    int cc=0,nr=0,i;
    for (i=1;i<=n;i++)
    {
        if (v[i]>c)
            return false;
        if (v[i]>cc)
        {
            nr++;
            cc=c;
        }
        cc=cc-v[i];
    }
    return (nr<=k);
}
int main()
{
    int r=0,pas=1<<16,i;
    in>>n>>k;
    for (i=1;i<=n;i++)
    {
        in>>v[i];
    }
    while (pas!=0)
    {
        if (!se_poate(r+pas))
        {
            r=r+pas;
        }
        pas=pas/2;
    }
    out<<r+1;
    return 0;
}