#include <fstream>

using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,i,m,st,dr,s,v[16001],sol,k,nr;
bool drive(int loc)
{
    nr=1;
    s=0;
    for(i=1;i<=n;i++)
    {
        if(v[i]>loc)return 0;
        if(s+v[i]>loc)
        {
            nr++;
            s=v[i];
        }
        else s+=v[i];
    }
    if(nr>k)return 0;
    return 1;
}
int main()
{
    f>>n>>k;
    for(i=1;i<=n;i++)
    {
        f>>v[i];
        s+=v[i];
    }
    st=1;
    dr=s;
    while(st<=dr)
    {
        m=(st+dr)/2;
        if(drive(m)==1)
        {
            sol=m;
            dr=m-1;
        }
       else st=m+1;
    }
    g<<sol;
    return 0;
}