#include <fstream>

using namespace std;

ifstream cin ("transport.in");
ofstream cout ("transport.out");

int v[16005];

int main()
{
    int n,k,nrt,i,st,dr,m,sol=1,maxi=0,sum=0,l;
    cin>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        if(v[i]>maxi)
        {
            maxi=v[i];
        }
        sum+=v[i];
    }
    st=maxi;
    dr=sum;
    while(st<=dr)
    {
        m=(st+dr)/2;
        nrt=1;
        l=v[1];
        for(i=2;i<=n;i++)
        {
            if(l+v[i]<=m)
            {
                l+=v[i];
            }
            else
            {
                nrt++;
                l=v[i];
            }
        }
        if(nrt>k)
        {
            st=m+1;
        }
        else
        {
            sol=m;
            dr=m-1;
        }
    }
    cout<<sol;
    return 0;
}