#include <fstream>

using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");

int v[16005],k,n,maxim=0;
int nrtransport(int x)
{
    int cnt=0,p=0,i=1;
    while(i<=n)
    {
        while(v[i]<=x-p && i<=n)
        {
            p=p+v[i];
            i++;
        }
        p=0;
        cnt++;
    }
    return cnt;
}

int camion(int s)
{
    int st,dr,med,ans;
    st=maxim;
    dr=s;
    while(st<=dr)
    {
        med=(st+dr)/2;
        if(nrtransport(med)<=k)
        {
            dr=med-1;
            ans=med;
        }
        else
        {
            st=med+1;
        }
    }
    return ans;
}

int main()
{
    int s=0;
    in>>n;
    in>>k;
    for(int i=1;i<=n;i++)
    {
        in>>v[i];
        s=s+v[i];
        if(maxim<=v[i])
            maxim=v[i];
    }
    out<<camion(s)<<'\n';
    return 0;
}